I have owned all of the pistols mentioned, and currently own
this
ISSC M22
And this
GSG 1911-22
Any Ruger, Browning or the Beretta Neos I had were all very reliable, I had a lot of trouble getting the Mosquito to run reliably though, after 80-90 rounds it would have to be stripped and cleaned to restore function, very disappointing as it was a decent pistol otherwise and looked great, but a bit small in the grips.
The GSG 1911-22 is awesome I may just keep this
and be buried with it. It runs all ammo I have tried (7 varieties) without a hiccup. Accurate as hell, and hey... it is 1911. for the price they sell for...
Kimber should be
ashamed of themselves. The GSG functions better, is better built and has more features at 1/3 of the cost. (although Kimber gets a nod for better finish quality)
The ISSC M22 is also one that is hard to put down... what a fun pistol. If you want a Glock trainer, this is it! Function was not as reliable as the GSG when I first got it, but after a little polish of the feed ramp and a good cleaning, it now runs federal blue box without issue. Accuracy is very good (target model) although I don't particularly like the sights.
For me the grip and feel of a 1911 is just heaven, so the ISSC will be sold and replaced with 1911 in 9mm.
So in short a GSG is great, Ruger or Browning, also hard to go wrong with (if you can stand the look of them and no holsters made for them), the Neos was good but a bit odd on the grip angle.
The Walther P22 was very reliable for me but grips were far too small (like it is made for 7 year old kids), and the Mosquito, though cool to look at and handle, was a bit on the small side, and was easily the least reliable pistol I have ever owned (out of 40 or so).