When I saw this module, I was eager to try it out. This is by far the best donation module I've seen. Being able to simply track donations as well as process the payment is awesome. After installing, I ran into some issues with Javascript. Turned out there was some strange combination that revealed errors in my template, not this product. However, Tuan Pham (the developer) totally helped me out and fixed my template! How cool is that? Also, I might mention, I submitted a ticket at 8:00am on a Sunday (USA--MST time) and the problem was fixed by 9:30am...so far the best support I have ever gotten from any joomla extension support team.
This component also can be used for more than donations...since you can customize all the labels, you could use it for whatever you need to purchase and track.

Ken is extremely responsive. He back-ported this to Joomla 1.0.X for me--within a very short time period. He also helped me troubleshoot initial installation problems. The tool is excellent and the support is even better.