Boy, I'm glad I tried it!!!!
First, I was pleasantly surprised at the cost. After downloading and using JD, I couldn't believe it was so cheap...but I'm glad it is!!
Second, JD is seriously plug-and-play. Everything that you need to customize is right there in the Administrator interface including confirmation emails, instructions, etc. I consider myself a fairly advanced php programmer - this was a breathe of fresh air, needing no back-end file adjustments or anything. Wonderful.
Third, you can't beat the support. There isn't a lot going on in the support forum (which is a good thing!), but I had an issue with another product from the same guy, and I posted in the forum and he responded-and-answered in a couple of hours.
I recommend JD hands-down; I can't imagine a donation situation where JD wouldn't be a good fit.