My only criticism is the lack of flexibility. It's evident from the forum that response to requests is often very quick and resulting changes have been made to the extension. However, I think that a better solution would have been to build more choice into the admin end, rather than changing the code to prefer one solution over another. Additionally, there are quite a few features built into the front end which definitely should be optional and more editable. Finally, I would echo a comment below and say that greater integration with Community Builder is a must.
Overall, however, this is a brilliant addition to Joomla's functionality, and will probably just get better and better.
Joom Donation is a great extension. Its a simple concept, which can be extended and developed with plugins etc.
The support is first class, very quick and thorough, so a big thank you personally to Tuan here, who is really helpful and on the ball. I have been using Joomla extensions for 6 or 7 years, and this developer is one of the best out there.
I noticed a couple of reviews complaining about paying for the add-ons/priority support. How can anyone expect an extension as huge and comprehensive as Community Builder to thrive without a proper revenue stream? Practically all the good extensions out there now are commercial ones. Programmers have to eat, just like everyone else! At least you get a chance to try out the main component, which is free, before paying for any of the commercial extras, most of which add really valuable functionality to what is, in my view, a first class extension.