Things I liked: I ordered two Crosman 0290 red dot sights. I mounted one on a 1984 vintage Model 1377 American Classic and one on a new Model 2240. The sights were well packaged, mounted easily and both worked properly. They are inexpensive and suit my needs.
Things I would have changed: For the money, I don't have any changes to suggest.
What others should know: The really good thing about this purchase was Pyramyd Air customer service. I originally ordered a Walther red dot sight and through my own fault, I ordered one that would not mount on 3/8 dovetail. Pyramyd Air graciously allowed me to return the Walther and replace the order with these two 0290 sights. Pyramyd Air customer service is great and the reason I will continue to be a customer.