I ran a new Volvo EW180 last year for 3 months straight, I actually cried real tears the day it was given back to the dealer, the only problem it ever had was the transfer case over filled with oil and the internal brake got stuck for 2 kms back to my place.
I used it for general excavation and ditch cleaning primarily, the VA boom was such a dream to use, it made getting into tight spots easier and balanced the excavator to the point where the stabilizers weren't needed. But it's off road abilities were obviously bad, all that weight on 8 tires, but it did pretty good. Any one who makes a living off those rubber tired units get mad props from me! :notworthy