I Have a vortex crossfire the rimfire model on mine its solid 2-7x solid construction clear glass and they make a throw switch for it as well. I have had a few of them now and they are all pretty solid.
I have multiple Crossfire II's on .22's, a .308 deer rifle, and an AR that I play around with at 600 yards some. I also have an Athlon Argos BTR 6-24 FFP on a Savage bolt action.
I'd rather have a clear 12 or 16X than a muddy 24X any day. It took me buying a few cheap scopes to learn that for myself, but it's the truth. I have good eyes, and I can see .22 holes at 100 with a 12X Crossfire. I couldn't see crap at 100 yards through an 18X Bushnell Banner I had.
I can't say too much bad about the Athlon (glass is comparable to the Crossfire, maybe a bit better, but the knobs are a bit mushy for my liking...the while thing is just not as precise feeling as I'd like), but I think I'd go with some model of Vortex. If Alan says the Diamondback is good-to-go, it is.
You might also consider some of the lower end Vipers in the $300-350 range.
Their Custom Shop made 3 different sized monster scopes. All with the side wheel focus. This was the largest one available back when Japan was manufacturing them.
Still popping up on ebay and GB from time to time but prices are all over the place.
I just threw it on my girls 10/22 for fun but now they won't let me take it off.
It will hit flies at 50 yards all day long. Great at 100 but with 22s, it will get blown off target with a bird fart.