D9  Wow! They're still trying to push this schlock?! At $50?!! I guess someone is fighting for their job security over at Aladdin...oops... Allume.

Like other posts have stated, go get yourself the free and more frequently updated software solutions out there that do this.   
(Version 9.1.1)

FLASH1296  Search for Leopard Cache Cleane, File Buddy, and MacPilot.

With these available there is certainly NO NEED for this buggy - underperforming - absurdly overpriced -software.  
(Version 9.1.1)

PALADINO  This chronically buggy piece of crap is brought to you by the same folks who bring you Internet Cleanup, another chronically buggy piece of crap.

I've used both, on and off since their inception, and have rarely experienced smooth going. I've now washed my hands of both of them. UGGHHH!!! NEVER AGAIN!!!!

First there was Aladdin which was taken over by Allume, and now it's Smith-Micro that owns these horrible apps. And none of the three had/has a clue how to make SC and IC work well.

Both Spring Cleaning and Internet Cleanup should be given a decent burial, and then, perhaps, rewritten from the ground up by developer's who really know what they're doing.

  
(Version 9.0)

JIMW  When Aladdin initially came out with this product many years I purchased it, given Aladdin stellar reputation at the time with such products as Stuffit combined with great support. What a mistake as this product was rotten at its core. Aladdin's attempt to fix this product slightly improved the interface but never address its basic problem which was it simply never worked properly. Personally I believe that this product contributed significantly to Aladdin's demise. In any case I eventually gave up on it and got rid of it - a decision that I have never had any remorse about doing.

If you subscribe to the concept that past history is a reasonable predictor of future results, I would suggest staying away from this product given its history, its current developer and previous reviews. The only way I would consider revisiting this product, even in a demo mode is if the developer emphatically stated that they threw away the entire previous code base and started over from scratch, retaining only its name. Even then I would be suspicious.

As for alternatives, I would take a look at Onyx and Applejack for free system cleanup products. For drive cleanup and organization I have found File Buddy hard to beat.

As for optimization, Mac's don't really need need it. However if you must, I find the best technique is to back up your data files and apps to an auxiliary disk; do an erase and clean install and then restore your file. An auxiliary drive generally will cost no more than software designed to do this and it has the added advantage that it can also be used for automatic daily backups.   
(Version 9.0)

BEZBOZNY  I don't know why but every time that i open 10.0.1 it quits unexpectedly...  
(Version 10.0.1)

MATHIAS  lol @ $49.99 for something which you can get for free with other numerous & mucho better apps.  
(Version 9.0)

FILCHESCAT  This is truly a rip-off which I unfortunately bought into last year. When version 10 came out a year ago, it would constantly give an error message when launched. SmithMicro never responded to repeated requests for help, nor with information on getting a refund. This new version not only continues with the same error message, it now installs something in the system library that presumably tracks days since last used and wants an admin level password. The un-install doesn't even work - had to track down the little devil in the library and manually trash it before it stopped asking for permission to use keychain. No thanks.  
(Version 10.0.1)

ED@MAC  Recently bought Spring Cleaning 8 at the Mall of America Apple Store. Wish I had read the MacUpdate reviews of Spring Cleaning 7 first. Same problems on my PowerBook G4 with OSX 10.4.6.

I could live with the non-Mac interface, if the program worked as advertised. But it doesn't.

First, "Duplicates Finder" was very slow; then after over an hour grinding way, it froze and had to be forced to quit. Same thing happened when repreated without searching packages: slow then crashed before listing duplicates or processing anything. Almost 3 hours wasted - that's why I am taking the time to warn others.

Image finder didn't crash, but didn't identify images that were attachments to Mail messages.

Music finder seemed to work, but gave no feedback if it had successfully imported MP3 files into iTunes - and it imported duplicates. It would have been easier to open two Finder windows and just drag and drop the files.

Spring Cleaning was so buggy that I was afraid to try Universal Slimmer.

Don't waste you time or money with Spring Cleaning 8.  
(Version 7.0.1)

M3L4NIE  I also HATE this software. I purchased it to clean up my hard drive. After installing Tiger, my Photoshop 7 acted up, which appears to be a common problem. It would take Spring Cleaning 3+ hours to scan the handful of megs on my HD, then it would take an additional 3+ hours to uninstall it. I had to do this several times to get all the Photoshop pieces off my machine. In total, it took me a week! Who has a week?? Not me. Uninstalled Spring Cleaning and will write own program instead. To add insult to injury, my rebate was denied - they didn't like the previous version# of my last anti-virus software. Too bad. A deal is a deal. If you only accept certain version #s, list them on the offer. Will not do business with mcafee/allume again.  
(Version 7.0.1)

ANONYMOUS  Thank God, I managed to put in a refund before the 30 days was up. No hassles on getting a refund and that is a good plus for the company. I will always keep them in mind if I'm looking for future products, due to their customer satisfaction policy.

However, the program is not worth $49. I purchased it mainly to uninstall applications. I does a fair job of this, however, it doesn't uninstall all applications. Uninstall a font manager and watch your ui get real goofy.

The other handful of utilities in the package are quite useless. I was hoping that the font handler in the program would fix font problems, but, it doesn't.

I might pay $5 for the uninstaller, as it is, without all the other stuff -- if the program included a database of applications (with an auto updater) that lets you know which programs it can uninstall (verified by actual testing) without resulting in problems.  
(Version 7.0.1)