Picked up the M5 from its alignment tonight, so drove it for the first time with all the new parts.
HOLY CRAP. Feels like a different car. Pretty sure it's the biggest improvement of anything I've ever done to any car.
Only 109,000 miles on the original parts, too, with no perceptible play. Didn't feel anything near this level of improvement on the e46, when I did it's overhaul at higher miles.
So very, very pleased! And now i don't have to worry about snapping the subframe diff mount, either :P
And with the m5 back on the road, I can take them m3 apart and dig into it once more
