Provided one takes the time to get profeicient with the .40 cal in that size platform it's a fantastic combo.
The Glock 19 & 23 are the probably the pefect carry guns, all things considered. Not too small, not too large, 15+1 in 9mm, 13+1 in .40. Hard to go wrong with them.
**Moved to the "GLOCK" subforum**