Compuvette
Marksman
I OC my Walther PPS. I got the slim PPS mostly because CCing a full size XDm would be... difficult. I find that even when OCing, the PPS is significantly more comfortable when I'm in the car! Another reason to OC a small pistol is in the situation where you prefer to OC but CC occasionally. It is very nice (familiarity, training, etc.) to use the same weapon for both cases.
These are valid points. Plus, if you wanted to switch from OC to CC you could probably un-tuck your shirt with a compact sidearm and you would be "CC".