I recently installed a Mantis V-Drive on my bow, and just as quickly took it back off. As was said previously: "But for the price of that sight.. I'd expect more."
During some tuning and (attempted) sight in, the sight repeatedly loosened about every 2-3 shots, after about 3 dozen arrows, the horizontal adjustment dovetail wouldn't even secure the sight, and the v-drive had a lot more play in it.
Trying to get this resolved now (through the retailer and trophy ridge).
Not slamming trophy ridge, just my experience with this one product.
[:@]