I have no idea how crashy (or not) it'll be; that's what releases are for, right?
In truth, I was thinking I'd ask for a couple of people to volunteer to do some beta-testing when I think the release is finally ready, but it'd have to be people who I know from here and who know what's in their computer, i.e., what kind of CPU / GPU they have, OS, RAM specs, that sort of stuff.
My expectation is that, given that I'm writing it on an ATi card, it'll work just fine on everybody's hardware correctly, and if you have a CPU/GPU powerful enough to run the game in DX9 mode with HDR on right now, it'll also run just fine, and in several important cases, a little bit faster, not slower. Basically, I'm working smarter, not harder.