I've been burned on rebates too, and honestly I don't care for the hassle anyway. Give me your best price up front or forget it.
This QS is most likely a dead ringer for Penn Plat Euro 5w40, which is virtually all GTL base and has a very GDI friendly add pack. And it's 19 bucks a jug. So there are reasons to use it over M1 0w40, which costs more unless you want to mess with rebates, and also has a calcium loaded add pack which is not as GDI friendly. It also meets approvals M1 0w40 doesn't, such as LL-01 which may be important to some people.
I bought an OCI's worth last Saturday I think it's going in the Passat soon.