WHOSYOURTATOR  Nice app but too expensive when there are free options like SmartSVN. I'd pay $25 to $30 for it. I'm hoping to see it in a Mac Update Promo soon.  
(Version 1.0.4)

WHOSYOURTATOR  Defrag feature should be renamed the destruct feature. Drive Genious 2.1 completely hoses my disk on my Mac Pro. The first time I tried it the disk wasn't even bootable. I had to restore from Time Machine.

Later on, I tried the degraf again. I created a disk image of my drive first, this is a must. The second time I booted to OS X install disk and ran a permission repair and a verify to ensure there were no errors on the disk. I ensured the volume would still boot, then rebooted into Drive Genius. I ran verify and no errors reported. I then ran defrag. Defrag completed and the computer rebooted. Files in OS X where hosed. Some I could not delete. I could not save files. I rebooted and my Mac Pro would just shut down during boot. Blah!

This time I restored from a disk image and was back up. Don't waste your time with Drive Genius.  
(Version 2.1.0)

WHOSYOURTATOR  I give Chronosync 4.x four stars up from three in my last 3.3.x review. The agent is a nice addition since it can keep FULL permissions in sync. I'll definitely be purchasing the new Chronosync Agent once my trial expires. The stability and UI performance are much improved of the main Chronosync app.

I've tried running my user home folder from external drives using esata and its just not sufficient for me. Chronosync fills the gap and allows me to avoid having to carry around an external drive to share between my laptop and mac pro. I just use a home-to-home sync before switching machines using chronosync and I have ALL my files with my laptop I am on the road and have no internet access. This is something that MobileMe's back to my mac service cannot do since it requires an internet connection.

A couple of suggestions would be to include some type of listener in both Chronosync and Chronosync agent that actively monitors file changes on each machine. This would reduce scan time and make this app perfect.

Finally, as always, support is excellent in answering questions. If you can't find what you are looking for in the application, just contact support and they are always prompt to reply.  
(Version 4.0)

WHOSYOURTATOR  Chronosync 3.x works as expected, the customer support is very responsive, but I am bumping this down to a 3 because its maker is actively advertising that Chronosync 4 was going to be released in December 2008 and its now January 2009.

Please be transparent with your customers and let them know why the release is delayed and when the new version is expected since you are marketing the "free upgrade".  
(Version 3.3.6)