This. I almost exclusively shoot the M9/92 now, just got a PX4 and it's similar. Went a long time without a Glock around and it showed back up in my stable recently. I find that it requires a completely different grip over the M9. Thus, IMO, if you want to get good with one or the other, shoot it exclusively for a good while. After 9k rounds in the M9 with a handful in other guns, it's really natural. I'll have to shoot the Glock a bunch for a couple weeks to really get the feel for it. I have a much easier time picking up an XD or M&P (the only one of those I have is a 22 compact, however), drive it out, and keep rounds on target.