They can be a bit temperamental, but once you figure out the do's and don'ts you will love it!
If you buy it, let me know and I can help you get it shooting.
Also, before mounting a scope you need to check a few things, because some manufacturers have screws that are about 0.020 too long! If you screw on in you will swear that it is tight and you won't know until you shoot erratic groups.
edge.