My experience thus far in comparison..
Xenforo's support has been great.
Xenforo's support forum and most members have been more than gracious is helping me with my problems which are usually caused by me or my lack of knowledge.
Design features are outstanding and do not even compare to other brands.
I've dealth with a very personal problem and my licensure and they have been more than admirable in their response. (I strongly doubt you would get the same response I received from a big corporation)
I see no legal comparisons to other brands whatsoever.
System runs very smooth.
Really, the only thing I really think XF lacks is a decent smiley system. It really needs to be a priority.
A few things I would like to see here. Less comparison to VB would be my first and my second would be less court room discussion-chips are gonna fall where they may-deal with it.
As far as add-on dev, you know there really is a lot of crap you DO NOT need. Less is sometimes better.