It's always a bit hard choosing the ratings when you're not either totally overjoyed with a product or despise it. Basically I'm happy with it but they should've made the centering screws a bit more snug. I'm setting the rear ones and then adding a dab of (red) LocTite to keep them in place. The front ones will do the fine tuning from time to time as it's needed; for keeping the screws tight I may either use a wee bit of LocTite or something else. BTW I'm using them with a Stellarvue 50mm finder scope, works great. Obviously the main plus point is that it's OEM and pops off easily so the 'scope can still fit into the Celestron carrying case with no problem.
Pros: OEM (so everything FITS), lightweight, quick-release
Cons: Adjustment screws a bit loose, need something to snug them up
This review was written in the old system and had content requirements that are different than reviews written today.