Things I liked: good build quality and fits 13xx barrels just the way they should.
Things I would have changed: not too much to change about these intermounts, they do their job well.
What others should know: you should know that these intermounts along with rings and practically ANY scope you mount will cause the barrel to flex and move when you use the stock plastic breech. I can't speak for the crosman red dot, which looks lighter. But for the BSA 2X20, a much heavier scope, these intermounts or more specically the plastic breech secured barrel just aren't up to the task of supporting it well. best to get a steel breech from crosman and then you won't even need these intermounts.
Things I liked: everything about them, including the price
Things I would have changed: nothing, except better instruction notes for those not familiar with mounting a scope.
What others should know: can't go wrong with these rings for 10 bucks!