Thank you all. :)
I had it out at the range today and put a decent amount of ammo through it. Couldn't really get the chrono to work properly due to the angle of the sun, but I'll mess with that again later. Anyhow, it did fine with everything, but it's a one-hole gun with Velocitors at 10 yards. That's nice.
We shot Mk Is in college, and I had a Mk II Standard (that was a one-holer with Winchester's cheap Wildcat load) that I picked up for $100 (and traded off, largely because it didn't have adjustable sights). I was sort of disgusted when they brought out the 22/45s, as I didn't think the heel-release guns needed fixing. To be honest, the grip angle on this plastic gun works better for me than did the one made of stampings, but I'm less thrilled with the slide release (which wants to be depressed and cannot for some reason be slingshotted closed - hope I didn't break something when reassembling it after pulling it apart at the store!).