Well I shot my pals Kriss this morning and I loved it.. he has a different rail on it than standard and a wee vortex on top.. brilliant fun.. very accurate.. he has had 500 odd rounds through it so far with no jams, misfeeds or any type of malfunction... it's a solid wee gun and will ragged hole off a rest at 25m (our max range).
I've not shot any other .22 ar types but to me this sets a pretty high benchmark...

I also got a wee shot of a gsg mp40! Loved it.. the owner promised me a go of his stg44 next time!!!