Version 0.95 has incredibly slow downloading. It seems like it constantly dumps peers (or peers dump you). I'm on a private tracker with HUGE numbers of peers and I still can hardly download (25KBps for about 30 seconds, then nothing). In comparison, I was able to get 600KBps in Azureus. Also, for some reason Azureus can no longer open downloads that were started in Transmission (something about the file size exceeding the total by a ridiculous amount).
Transmission
Xbox Live Friends
Unable to Connect to Xbox Live
The error returned was "NSRangeException : *** -[NSCFString substringWithRange:]: Range or index out of bounds"