INFOSEC  I know how you feel. I purchased the pro version of 3. After not too long 4.0 came out. I paid the hefty pro upgrade price. It fixed some annoying bugs and added a few new features but I felt that the upgrade price was too much. I am still on 4.0. Considering what is included in each upgrade I don't know when I will upgrade again. If you own the pro version they try to squeeze $70 a year from you! That is crazy!  
(Version 6.0.1)

INFOSEC  Nice update! Version 2.0 loads faster and uses less memory. It imported all of my stuff from version 1.5.1 with no issues--all 89 entries.   
(Version 2.0)

INFOSEC  This is a great application but with some issues that may or may not impact you. I love that fact that you can encrypt the database. I think that should be a core requirement for an application like this; what if your laptop or desktop is stolen or sold--the person that later has it may be able to discover that database and use those registration numbers or upload them to a warez site for many people to use.

One of the issues I have is that once I had added about 40 applications to the program it started to take noticeably longer to startup. It also developed much higher memory usage. Last, the database grows in size quickly also.

If you don't have a lot of applications (40+) that you plan to add to RapidoSerial then this is a very good/the best solution!!

Thank you to the developers for providing this as freeware/donationware. I hope the performance issues can be addressed.   
(Version 1.5.1)

INFOSEC  Great application! Nice UI, nice features, and fast. I love the crop options.  
(Version 1.3)

INFOSEC   I purchased this app today after testing a bunch of them. I like how the filters, labels, auto rating, and smart filters features work together. If you have a lot of feeds then it may take a little time up front to configure those four things to take "full" advantage of them. However, once you do that you will see how this app outshines the others and does the best job of organizing the feeds and providing view options that boil the information of interest to the top.

There are many features with this app, you have the option to be in total control of what is going on and how to manipulate the data.

In my opinion the only negative thing I can say about this application that documentation needs to be expanded. I expressed this to the developer and he very quickly responded and advised they are currently in the process of providing additional documentation.

If you try this app take the time to understand all of the features and how nicely the the label, filter, auto rating, and smart filters can work together to present the the feeds in a very efficient and effective manner. Even thought there are some free alternatives I felt that unique features, stability, speed, responsiveness of the development team regarding questions, and logical workflow all made this product worth $30.   
(Version 1.1)

INFOSEC  This is a very innovative application. It makes both organizing and finding data much less painless. I have accumulated over 600Gb of disorganized documents, videos, pictures, and other stuff. It would have taken me a long time to organize that mess with finder and Quick Look. Within about an hour and half I was able to organize my mess with Leap and can now find stuff much faster.

I will buy this as soon as the production version is available. The developers are also very responsive to any questions or feedback.  
(Version 1.0b5)