if its like any other merc apart from one built in woking about ten years ago, it'll be a shit drive, but it'll be great to be a pillion on. The chassis will be utter handling poo relying on all the sensors to do the work and half of them will pack in anyway the minute it's out of warranty - oh and the dealer network will be a bunch of nobs as well.
Each to their own, personally I prefer the transit, but to be fair I bought it for my transport manager and it sits on his drive not mine.