I must be in the minority as I like the CM's Legioss more than the Tread. Neither of them lock together particularly well, but the Legioss has integrated landing gear and a greater level of detail than the Tread, which relies on the sucktackular steel boom to keep it steady on the ground. The Tread does pose a lot better than the Legioss thanks to the better hips and poseable head, but the Legioss just looks meaner and more aggressive than the Tread, which looks kind of ... I don't know ... adorable.
This is all beside the point, of course, as this is a Aoshima Tread Thread. Hopefully Aoshima's "upgrades" aren't anything like the "upgrades" they did to the alpha