As far as the sights go, The old ones did have some bugs. The old ME wich they dont make anymore, is the one that had issues with the bolts breaking and such. It was also extemely noisy. That is the one I have, and have had no issues with it other than the noise. I took care of that with some limbsaver strips. The new XR is the best one, with the floating adjustable 4th pin and light, but at close to $200.00, I would go with the LE or SE for closer to $100.00. They do not come with the light, but you can get the Rheostat light kit for around $30.00. You will deffinately need the light kit. These sights do not gather light very well in dim light. Personally, for the money, I would go another way. For half the price you can get a quieter, brighter sight.