Picked up one of these from Ebay a year or two back as I have a Brabus Smart and they have no oil sump plug so you have to do it this way.
A lot of garages have switched to doing it this way as well, particularly if it's a cheap all in service. Advantage is it's quick and painless. It doesn't however remove all the oil as you have some left in the sump, like getting the last bit of a milkshake through a straw. Also you don't get to check things as much as you would normally, so i'd say do a proper one every once in a while!
Lee
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