I own both a 3350 and a 2650, took delivery on them beginning of june this year. They replaced our bx23s and 2680, both of which were little problem childs, but thats a different topic - long story short - kubota corporate stepped up and made it right. Anyways, I am an electrical contractor and have the BH77 on the 2650 and our 3 point bradco trencher on the 3350. They both have about 60 hours on them and here is my experience so far:
No problems with either but they are still "young"
The 2650 is the smoother runner, starts quicker, is matched nicely with the backhoe, easier on fuel and seems slightly quieter.
The 3350 is definitely the stronger tractor, having that turbo and all emissions garbage when we use it she gets run full throttle and it trenchers the stinger with ease, even in clay. Very happy with the power and 3 point performance. I guess I will talk to my dealer in light of this info.