i think remote starters are a great idea in winter. have one for the family van which does daily train station / car pool service and it's great. the problem is in installation - circuit city took 3 visits to get it right! i found out later that they were basically doing it almost by trial and error. once they had all the hookups done i did all the reprogramming from the control unit.
if an installer is very familiar with MB's i don't see why not but there aren't a lot of them out there. MB's electricals aren't that complicated - just obscure since it's not what your neighborhood alarm installer deals with on a day to day basis...
1993 300e-2.8 - gone now <sigh>
"Do not adjust your mind, it's reality that's malfunctioning"