Austin, is the group buy $700 Klann the 0021 kit or the 0025? The 21 is cheaper. The 25 adds a safety shear pin so if some idiot uses an impact gun, the pin shears and the tool isn't ruined. It even comes with a couple spare pins, IIRC. I think there's another feature difference as well but can't remember it offhand. Either way, the price is still good.
On a side note, I don't know how well a tool that grabs the spring from the outside would work on Mercedes. They can be pretty limited on space around the springs....
Regards,