We have a Burstner t690g 55, before that we had a Burstner t821, both had very good fit and finish, on both we have had to have the cab binical changed both on warranty , but both a fiat problem , We had to change a valve on the Aldi heating on the 821, other than should not say this, but nothing else to report.
We have visited the factory with the burstner owners club [now defunked]and the firm bent over backwards to help anyone with a problem, all at cost. Very pleased with our Burstner drives well looks great and works, what more can you say?
Hope that helps a bit......