I have 3 MBs that require premium (for that matter, the modified VW engine drinks the same).
If that's what is labeled on the gas filler lid, so be it.
While the benefits of premium may fall along the lines of "snake oil", I'd rather just follow the manufacturer's recommendation and do such. The expense is justifiable for peace of mind, and a lot cheaper than whatever potential damage to engine components that can result otherwise, theoretical or not.
It's amazing how many here will gripe about why our cars require fuel that costs 30 cents or more per gallon than the regular stuff (at least in the US), but don't flinch at spending $$$ getting euro lights, pricey rims and tires, stereo upgrades, etc. etc.
2009 ML350 (84K) - Family vehicle
2001 CLK430 Cabriolet (71K) - Wife's car
2005 BMW 645CI (124K) - My daily driver
2012 Mustang V6 (60K) - Daughter's car