Couldn't agree more, I ditched the SXSW app about two days in and instead used sitby.us. The SXSW app wasn't catching everything I signed up for on the web and the radio button thing had me confused for a bit before I figured it out by looking at an event I'd already selected to attend. The constant slow reloading of the entire list got on my nerves quickly.

Sitby.us was faster, cleaner and much easier to work with on my 2G iPhone the whole weekend.