I've shot a Buckmark style Mark III and it was terrible. Don't waste your time with Walther 22, it really sucks. I bought a used Sig Mosquito and my brother also has one that he bought new (I've shot that one too). I just took it to the range and shot Winchester Super X and Federal Lightning, and CCI mini-mag. All worked fine, except last round would not lock slide back most times (that was with all). I think my thumb was keeping slide release down. Based on my results the cheap stuff works with Mosquito, but will continue shooting some and report back. So far I like this pistol.
Beware though; your 9MM or 40, etc will feel like a cannon after shooting the 22.
Thanks for the info. Had my heart set on one and had almost decided not to get anything(never seem happy settling for something i didn't really want to start with. How was the accuracy?