alaea2 e mount to a mount adapter

I recently played with the sony alaea2 adapter which has the mirror and focusing feature for using A mount lens on nex cameras. I tried it at a sony store on a nex 6 which I have and a Sony 16 - 50 2.8 lens which I have for my A 65, it felt, to my supprise, very nice considering the size of the nex 6. 

Has anyone used it? Any issues?

Thanks