I have an ankle holster that I used with my G26 (sub-compact). Its a Don Hume with a thigh strap. I found it to be comfortable. It held the pistol well. The two issues I had with it were:
I noticed that because of the extra weight and the slight bulge, I was walking with a bit of a limp. G/F noticed it. I kept wearing it for a couple of week to see if I got used to it-- Nope.
I also agree with others-- its way too hard to get to the pistol. As I practiced-- I noticed that I didn't bend as well as I once did
An ankle holster may be an answer for occasional concealment, but IMO its not a good every day carry rig. I put it in the closet. I carry with a CTAC slide now.