I have a late model 2011 27" IMAC and wanted to mount it on the wall to give me more real estate on my desk (and it looks cool). No real reviews on this model, but I have always had a good experience with OWC and decided to order this unit.
Again, not a lot of experience, but it seems well built, looks nice and does a nice job for me. I was worried about how flexible it would be re: custom viewing angles, but it seems to be very adaptive.
I did have an issue with removing the foot/stand. The "bale" or connector that is attached to the stand retracted back into the Mac. The local Apple Store has a Bale tool and it literally took them 3 minutes to have the mechanism back into place. In fairness, I think that i have a faulty mechanism.
This said, the only advice I would share with the novice (like me) is to watch a couple of YouTube videos on removing the stand. It is not hard, but there is a slight trick in getting the stand locked into place with the screws exposed for removal. Not getting the stand locked into place is the difference between a 20-30 minute installation compared to several hours or days of aggravation.
Overall, easy to install, works great and worth the money.