I've used the Heritage/Cold Shot MOAB, ERATAC inclined, and the newest Ivey, they all work (just fine for me). Are they worthy of what? The cost? If your scope doesn't have enough elevation, you can get a scope with more elevation - adjustable, "problem" solved. Or get a rail and/or rings with incline built in - neither of which are adjustable. Or you can get an adjustable base. Its situational. If you want more info, suggest being more specific.