After good results with the bulkier M6X, I tried the more compact WL1-AA. The rail mount is beautifully designed for a fast but secure mounting. The windage & elevation screws were so loose that the red dot actually moved while removing the adjustment wrench. I sent it back for warranty adjustment and am still waiting after 2 weeks...
Pros: Rail mount is easy and fast.
Cons: Windage & elevation screws quite loose. Warranty service is slow.
This review was written in the old system and had content requirements that are different than reviews written today.