We had a Makerbot z18 at work and ended up returning it. It had issues from day one.
We replaced it with a
Rostock and have been very happy so far. Ours uses an E3D v6 hotend.
On Spectrum we got an
Airwolf 3D HD2x a little while ago and it's been pretty good to us. We've been pushing it's limits working with a lot of polycarbonate filament so it hasn't been perfect but it's handled our abuse pretty well. They also have fantastic customer support, I have about a 45 email thread going with one of their customer support people, nothing particularly wrong, just asking questions and getting answers back pretty quickly.