yeah, it can lower the motor 15 degrees, as long as you have the room. my ni-mh packs are tight in that space as it is, so i couldn't drop it down the 15 degrees. small lipo packs should fit with it lowered without a problem though.
the other major difference between this and stock is that the G1 plate and 3 screws replaces all this:
so there's some weight savings as well. the spur/pinion are exposed now too, so i'll just have to blast some air over it every other run or so.