I carried a Glock 21 for 9 years on the road before going undercover and would say that if I had to go back to uniform and a .45 was required it would be a hard choice for me between e Glock 21 and the HK 45. That being said I was issued a Glock 36 for a backup weapon and during the 12 years I had it I never cleaned it and only shot it during qualifications as the gun never felt right for me. Needless to say it never had a malfunction of any sort I just be never cared for the ergonomics of the gun. I would buy one if it fits your hand and it meets any other criteria you might have.
These are my carry pistols.
I carry the G36 most in a Crossbreed Supertuck holster. It is reliable and accurate and lighter than my other pistols... but I do like variety. My Custom Carry Compact is just as reliable as my glock and extra mags are easier to carry, but as the G36 is lighter, the 1911 gets left home mostly. The Beretta is the bulkiest of the group (single stack Type M) but I bought that more as to extend the collection more than as a carry pistol.
FWIW: I have full size versions of all three and the Glocks get shot and trained with most. Also, I am a die hard 1911 fan, but I prefer Glocks for use as tools.