Never heard of a XD-45 "Sub" Compact, There is an XD-45 Compact that is a service model (4" bbl) and a compact grip or "officers grip". To my knowledge SA does not make a Sub Compact 45.
If you are talking about the XD-45 Compact then yea, that is a nice weapon. I actually just bought one that hasn't come in yet (Teusday) but I have fondled them as well as shot them and they are pretty sweet. This is coming from a 1911 guy too, so I sometimes think all triggers and feel of a gun should be as nice and the XD to me actually is or is as close as it can be, I was surprised.