7g has its ups and downs. so far i've tried it long term in the slk and ml and they seem ok. its just that you have to learn to drive the way it wants you to drive rather than what you want. the good side is that it gets the ml amazing mileage. i'm doing between 11-12l/100km on average whereas my t-reg usually does about 14-15l/100km's (albeit the t-reg is heavier). the con is that it makes weird sounds when shifting from P to D or D to R. it sounds like a light grinding of the gears. and sometimes it can have really harsh downshifts when decellerating. it doesn't happen all the time, but when it does, its quite noticeable (maybe something to do with the 4matic??). on the slk, the 7g is great. especially when you leave it in sport. its really quite rough and aggressive (which can be good or bad depending on personal preference)..personally, i like it.