This is a great, GREAT, kit and you will have many hours of enjoyment putting it together, whether OOTB or doing some super detailing work.
The only problem I've found on the ones I've built so far is in the plastic wrap-around brake pieces in the rear. Being plastic they tend to break apart if you try to wrap them around those drums on the side of the trans. more than once or twice. (Don't remember the numbers on the parts at the moment.)
Another thing you might check into is the many photos listed on tanxheaven.com. There are a couple of the /85s shown there that have been super-detailed, esp., on the insides, and there is literally a king's ransom of ideas for a builder to add that will take the model way above what is offered in the basic kit itself on any of the four kits Trumpeter makes.
Am waiting now for some of those PE sheets fron Part I think is the company's name, before jumping on one of the /85s. Also Air Connection's, soon to be published book on the T-34 as well.
Bet you won't be able to build just one of these things.
Good luck and enjoy, Sgirty