I have a couple Official Police (OP) 22's. I like them, but I would not suggest one as your first range gun (22). They do not have adjustable rear sights. If you are thinking "Colt", look at the Officers Model Match (OMM), or perhaps one of the Trooper Mark III's. The OMM is superb.
After you get the Colt 22 revolver bug, then you start getting things like OPs, Diamondbacks, Cobra's, original Trooper, Officers Model Special, Officers Model Target, and Police Positive. They are all good.