I bought one when I first desired sub40 times...
I don't know about other people's cubes, but this type A is EXTREMELY stable and fast. If you buy his lubed version, it turns like a dream yet there is a little "melting" effect (very much like jigaloo, it might break in the pieces faster anyway).
At the moment, it's been 5 months (of intense use) since my purchase...
The cube is currently VERY GOOD at cutting corners, and pops only when i do something horribly wrong.