As I promised, went to 5280 Armory in Lakewood CO and rented a Colt/45 like the one below. 100 rounds of their ammo was only $16 per box..great people there, as a shout out to the range and store.
MY impressions with the caveat that I have some artritis in my RH wrist and have a poorly repaired RH thumb that was dislocated.
-Recoil higher than my G-19 and G-17..not THAT bad, but kinda surprising considering it's weight. The dovetail as it pressed against the top of the base of my thumb..it hurt when I shot it. NOT slide bite but the downward movement against top of thumb wasn't great(I still shot about 60 of the 100 rounds, my son's shot the others, oldest son now wants one..)
-VERY accurate..at 7 and 15 years..easy to shoot 2 handed..one handed, because of heft, kinda hard, FOR ME
-Had one fail to eject..2 handed shot.
-Slide release very sensitive..once forward w/o hardly any pressure
-Mag button kinda hard to push..well used gun but I suspect that isn't a design thing but cleanliness or something. Only 7 round mag tho...Neither good nor bad..makes using ammo slower..good thing.
-Oldest son..first time shooting it, couldn't get it to fire, until safety off..DOH...he's a glock/striker guy too
Overall, great fun and glad I rented it. As I said before, the grip isn't as comfy FOR ME as the 'sculpted one' of the Glock. Great example of a traditional design and John Browning was a genius to come up with this basic design almost 110 years ago..and it's still going strong.
Gonna stick with my G-17 for now tho...