It's impossible to know as the specs often change on the fly, and the build quality is totally inconsistent.
Shining Beam just got the new SST-50 light in. I have the older version (MC-E) and it's far higher quality than the DX MC-E light it replaced, and well worth the few extra dollars.
http://www.shiningbeam.com/servlet/t...-dsh-50/Detail