Should I upgrade XBMC to a beta/nightly build?

I’m currently using Plex. While it’s pretty fantastic it lacks quite a few features I’d find handy. I also installed XBMC (right now I can’t tell if I downloaded it from NitoTV or from atv Extras…) but it’s kinda sluggish and buggy. If I seriously wanted to try XMBC out, would it be worth upgrading to a nightly build? If so, how would I go about doing that?