I bought a refurb off of Hatsan's site and have had a lot of fun w it shooting off hand.
Other than a double feed that jammed it up (totally on me) I haven't had any issues w it and it's been a good purchase.
Very rugged, seems reliable enough and not too picky about what you put thru it. It's not a wall-hanger. Ugly AF, but functional and also something that I'm not afraid to expose to the elements or to use as a loaner. Hatsans are some of the weirdest looking guns out there, but the ones I've handeled are remarkebly ergonomic. The Hercules Bully is no different.
Plan on using a whole lotta air.