The helac tilt function has one major thing going for it and that's the lack of hoses. For those that haven't seen the latest edition of Earthmovers, there's a piece on Ed Butler's Kinshofer setup and he makes the perfectly reasonable point that if you are mucking around in vegetation it's a major advantage. Against this you have roughly half the tilt force, which in offset digging means half the breakout force.
I know there are guys on here with Kinshofer units and I'll leave them to sing their praises, but I wouldn't touch that Danish beast if it was gift wrapped.
On edit: They're also narrower which is really helpful in deep trenching. With a conventional tilty you have to go twin hitch