General Comments:
How things change!! Its incredible to think that the Bremen factory was still churning these things out as recently as 1995! It's seriously outdated in the way it drives, performs, comfort etc, yes I know it's already old, but compare it to something like a 1986 Transit or VW Transporter/LT and it still seems like it's from an older generation - it even has a separate idle speed controller on the dash for cold starting, how quaint.
Non-assisted steering is seriously heavy, The gearchange seems to be set up for LHD, even though it's a RHD; you really need to reach for it and the gate is very imprecise.
The semi-forward control layout means the engine is in the cab with you, and gets a bit noisy whilst traveling, and also means some engine jobs are very tricky because of poor access.
Performance is not the disaster you would think; it uses the OM616 inline 4 naturally aspirated diesel from the 240D saloon cars, producing around 68 bhp. No ball of fire, but thanks to decent gear ratios, satisfactory (if noisy) progress can be made as long as you don't climb too many steep hills with a heavy load on. It's still pretty good on fuel however, considering it's a big, heavy bluff fronted van, anywhere between 25-35 mpg, and it will hold an amazing amount of stuff in the cargo area - it's massive.
Pretty much any part you may need is still available new, which is a plus.
Of course, the other thing in its favour is the Mercedes reliability - this comes from an era before everything was controlled by little black boxes, and before Mercedes was run by accountants. Mileages of 500,000 have been known on these machines, a benefit of the relatively unstressed engine (small power output for its capacity).
If you have the choice, I'd go for one of the 310 5 cylinder versions for the extra performance.