I've been looking for a M&P .45 to go along with my Gen 4 G-21. I found one yesterday at Gander Mountain. Keep in mind I am already issued a S&W M&P .40, so I was already familiar with the gun. At my department, we qualify 4 times per year. My impressions are that the M&P is a reliable, simple, durable design much like the Glock itself. But the .45 M&P was the first I could call my own. I usually stick to Glocks, but thought I'd 'broaden my horizons' a bit. I took it to the range and put about 150 rounds through it. No rules, no range staff, just me with the gun. Naturally, there were no problems of any kind. The gun was as reliable as my issued .40. But here are a few more impressions: My new Smith and Wesson M&P .45 compared to my .45 caliber Glock 21 Gen. 4. Both are box-stock, with no modifications of any kind. After about 150 trouble-free rounds, I did feel more recoil with the M&P than I do with the Glock. The trigger had much more take-up and felt more 'gritty' than on the Glock. There was more muzzle flip with the M&P as well and it took just a tad longer to get the sights back on target. I think the recoil and muzzle flip can be attributed to the curved backstrap of the Smith. Recoil seems to be channeled into a smaller part of the palm, right at the apex of this curve. The straight(er) Glock backstrap and the grip angle helps to distribute recoil to a larger part of the grip, giving the sensation of a softer recoil. Both are good guns, however, each with strengths and weaknesses. The good thing is that if you have a Blackhawk! CQC holster for the G-21, it will also fit the full sized .45 M&P. Conclusion: Based upon my own experience and shooting impressions with both platforms, the Glock is still a better weapon. Recoil is softer, and more linear with the bones of the arm, shot-to-shot recovery is faster and the Glock trigger feels more positive and breaks much better. All in all, the Glock feels more "solid" and I have more confidence with it. Until I carry and shoot the M&P as well as the Glock, I'd have to say that the Glock wins this comparison hands down.