I'm very surprised so many people appendix carry. But since it's so popular, I might give it a try.
I do have a question, what do you do when sitting down? Won't the barrel dig into your leg?
I had to move the holster around until I found the sweet spot. Now unless I didn't have it set right before a long trip it doesn't hurt.
I carry a full sized M&P appendix at about 0100. I move around a lot for work. It does get in a bind at times but a simple adjustment and I am all good.
Doing some drills this Sunday reminded me of how hot the barrel can get... and being in the appendix position was a little odd.