I looked at the Kinshoffer unit a few months back and ask the salesmen where would go to see one working. Correct me if i'm wrong, but they didn't have one in the UK they could show me! I looked at the price to repair the tilt unit and it was about £3500 if it went wrong and to replace two rams on a tiltrotator is about £700 - £800. The initial cost of the Kinshoffer was about 20% more than an Engcon. If something goes wrong with my tiltrotators I like to try to fix the thing before I call anyone in, but in the Kinshoffer everything is sealed in the top of the unit. Hard to get to.
Steelwrist looks like a good machine, but you must consider service on kit like this!

I am based near Inverness are you close by?