I have the Unplugged Lowering Brackets and camber adjusters (rear only).
I bought the one from EV Tuning that uses the factory upper control arm, and turns the inner bushing into an eccentric bushing/bolt so you can adjust the camber angle. The problem is, on air suspension cars, it requires you to have the ride height re-adjusted at the SC any time you adjust the rear camber, because it moves the mounting point for the level sensor arm.
They're in the process of redesigning it, but in the meantime I'd suggest this:
N2itive.me Discount Coupon Codes » N2itive.me
It keeps the air suspension ride height sensor arm in the factory position, so you won't have to re-adjust your ride height...and it gives you more range to adjust rear camber.
The front camber is slightly adjustable from the factory, and even lowered I got my front camber angle to -1.3 degrees on both sides, which is fine.