Anybody use MyBB?

For me, I like MyBB out of the other forum software choices. I like it because it's fast, user friendly and really, it just works. Also there's a wide variety of plugins, mods and themes that are all very customizable.

For other forum owners out there, what software do you use and what's cool about it? I have tried others paid and free and they just seem clunky and bleh... Vbulletin and IPB Power Boards just didn't appeal to me and didn't feel as smooth as MyBB and let's face it, why pay for something that MyBB does well in my opinion?.?.

I'm just curious what forum software you use and why...