I've got a Hawke SF 4x16 on one, which has a very nice reticule...which is a lot of scope for the money actually....and a Clearidge XP 6-20 on a HMR. The Clearidge blew me away. Way clearer than my Leupy Vari-X III.
Never looked through a Clearidge rimfire scope, but would definitely not be scared to give it a try. They are my new brand of choice.