Someone here tested i with a meter a year or so ago and the light puts out a real 380 to 450 lumens. The latest version with the Cree xm-l emiter will be much brighter.
I don't think the term "much brighter" is very accurate. And at the price mentioned you could almost get two old lights for the price of a new X-ml version.
I do agree that the "lumen" count is a tricky issue. The MS 900 uses a "floody" reflector makes brightness comparisons with many lights difficult.