I have the air ranger - great rifles and reliable, electronic models will at some point need a battery change depending on use I had the Mk3 and eventually the batteries fail although not a difficult fix (follow the maintenance instructions not like me) and you will get better service from them. The electronic triggers are good and I recommend them you can also adjust the power for shooting in confined spaces. As for the shot counter etc useful but not necessary.
Customer service - I've had no problems and they helped me out when I needed it with parts etc.
Make sure you try before you buy get the power chronographed. As with any gun you'll have to find a pellet which suits the barrel.
Weihrauch HW97 .177, Weihrauch HW80 .22, Weihrauch HW77 .22