Short version: I liked it it, it worked fine.
Slightly longer version: Pulled off the White and put the ACS on. The ACS is narrower, so I didn't need to go back with the spacer/washer I used to keep the frame out of the way.
Worked, really, great. Maybe if you got a ruler out you'd find out it has a tiny bit of up-down wobble compared to the White, but that's about it. It's obviously of higher quality construction just to play with it.
During gate practice I heard one crunch out of it, like a typical ACS break-in thing, but otherwise no problem all day. In fact as far as riding goes, no diff between it and the White, and I rode it hard every lap.
I'll write up a longer review for the mag, but based on price point especially, plus this being a company which supports BMX, looks like a win for ACS.
Also, took a hella' face plant today which got me knocked out and an ambulance ride, so I don't feel much like writing at the moment. (It wasn't the freewheel's fault.)