A few guys at my FT club use them and are like them very much. I looked through a few and was impressed-clear glass (even all the way up to 32x) and a nice fine reticle.
The only downside is that they're not springer rated. So you must use this on a PCP, CO2 or multi pump air rifle. Unfortunately, Mueller does not make a target wheel for this scope so if you want one, you'll need to purchase either a machined one from Marmot Militia, or a 3D printed one.
Hope this helped.