The follower is a variation on the green G.I. follower, and it will tilt if you push on either the front or the back.
I'm going to get rid of these mags one way or another. I don't think they're as good as PMags or plain old metal mags. One will probably go with the OA-96 pistol when I get another pistol upper. Hopefully, I'll sell one or two more along with the Colt M-16 BCG that I need to sell.
A Lancer representative on the AR15.com forums has said that Magpul anti-tilt followers won't work well with the magazine body. They aren't compatible with any aftermarket floor plates with pull tabs either.
UPDATE, 1/16/11: I've run one of my Lancer magazines through a couple of rifles, with no issues. I haven't really heard anything bad about them from anyone else either. Some of the guys that run carbine courses are recommending these. I'm afraid I've got my foot in my mouth on this one.