Though it still doesn't have a "pretty" graphical interface, it is elegantly simple and has worked really well for me on intel macbook, and PPC G5 dual 2ghz machines. I have a nice collection of impulse responses that I have gathered from free sources. I use this plug-in regularly and it is my go-to reverb.

Now with LAconvolver, I have a freeware (donation-ware) reverb unit that is better than ANY other reverb I have access to in software or hardware.