It depends - I only spend a max of six days a year on it as it is belonged to a friend. I pull 15-16 t trailers with it on rough Irish roads and find it very very bouncy even with Soft Ride turned on. Also I find the engine very dead unless it is well revved out. It is a bit light for towing as it can be quite nose light.
Compared to our old Fords the cab is nice but I'd prefer opening side windows or roof.
I found the T's and 50's worse for bouncing but saying all that if I was buying a Valtra in the morning a 6350-6850 or 8150-8450 would probably be my fancy.