Things I liked:The Crosman 0290 Red Dot sight increases the pleasure of shooting my Crosman 1377 air pistol 200%. My old eyes don't work well with iron sights anymore. This sight is very inexpensive and works quite okay. There is no brightness control so it is a little bright for indoor shooting but works fine outdoors. I liked mine so well, I bought this one for my brother. Things I would have changed:Add a brightness control.