I almost don't want to comment on this.
I'll go 20 injections with NO Problem, then the second I tell someone how it's so EZ, that I almost do them all there, I get 2 sore as hell ones in a row. But it's still my favorite spot for sure.
A lot of the pain revolves around the Gear itself. My beloved Shanghai bites me pretty good...(just like Mex Gear), but I grow so well on it I put up with it.
Schering, Upjohn, even Galenika's...nothin'.
I like 'em High/Side myself...low/front seems to net me more problems than other areas of the Thigh (although High/Front isn't bad either)....but that's just me, I've heard exactly the opposite from other guys that have no real reason to lie about it, so I suggest trying different areas to see what works best for you.
TSW