I've had a G37 for two and half years now and absolutely love it. I reload so ammo is not an issue whatsoever. For me, its the perfect balance of power, size and recoil, in fact I enjoy it so much my G17 and G22 seem to spend more time at home and less and less time at the range. I love the concept of a .45 caliber gun that feels identical to the other two Glocks I own. I feel it is one of the best pistols Glock has produced. The new G21SF from what I hear are still a bit on the chunky side, but do carry 13rds (not an issue with our 10rd mags in Canada), so I believe the G37 is the perfect Glock, its the same size as a 9mm or .40S&W Glock, holds the same amount of ammo, recoil is tame, a nice push that is easy to realign the sites back on target for quick follow up shots. Plenty of power, of the six factory JHP's I have tested they all perform at or above .45ACP specs.
I am more than happy with my G37, its my favorite Glock in my trio and its incredibly accurate. I can't think of anything else I could want in a .45 caliber pistol!