To me, the Gen 3 9mm grip is too big, but acceptable. The Gen 4 9mm with no added backstrap is a little big, but not bad. The Gen 4 10mm is to big, unacceptable.
The XDME 10mm is a little big, but acceptable.
The M&P 10mm was odd. Glocks are like a 2x4, this was like a 1x4, except in the back...