I can't comment on the E70 but I use the BL7000EXT on my E53 and it is absolutely rock solid and makes life so much easier working on my E53 and E46 in my garage. I use the SUV and light truck adapter and they are all the way out to the 66" edges but fits right where it should. You may want to look at the BL6000EXT as it has a 6000lb capacity with a max length of 76".
One of the best features is the QuickJack is stored against the wall with a very small footprint when not in use.
Just from my personal experience, I would definitely buy another QuickJack. The customer support from BendPak is nothing short of spectacular.