JEFF HENDRICKSON I've been using REALbasic since version 5.4. It bothers me sometimes when I see it described as a "hobbyist's" tool. I use the pro version of this excellent development tool exclusively to develop my cross-platform commercial software products, including "Purify."
REALbasic offers a lot, and like anything else, you need to dig into it to discover its true capabilities. Technical support is great, and responsive. The online support community is great. The product has everything that you need to do real cross-platform product development. The only plugin that I've ever needed is the MySQL plugin for some of my Linux server based apps, which by the way works great. My primary development environment is OS X 10.4.11, on a dual PowerPC Mac with 1.5GB of RAM and a Cinema Display, and REALbasic is a pleasure to use in this environment.
My recommendation, if you're looking for a powerful cross-platform development tool, look no further than REALbasic Pro.
(Version R2)