I have owned one for about a year now. It's a great rifle. Very powerful, (about 34 fpe), accurate and quiet. The shrouded barrel looks great and you have to actually explain what it is to people around here since it's dimensions and appearance are similar to a conventional barrel. I typically get 3/4" groups at 50 yards.
I've got two complaints about it though. I find it very front heavy and it has no safety. If you get the standard S410 or the carbine version then you'll have a less awkward rifle, but it will be less powerful, more noisy and get fewer shots per charge. Still, the carbine version is supposed to put out 28 fpe which is pretty darn good and I could live with a little more noise considering how very quiet the 410E is.