This jar is more efficient than the one that came with my quite old blend tech. The plastic seems more durable, easier to clean and because it is of a slightly different plastic I guess, it is much quieter than the old one.
The blendtec works great when it is new, the motor is super powerful but the jar is trash. Not functionally but with regards to how it holds up. The seals and bearings fail after light use and cannot be serviced. I wouldn’t have purchased a blendtec had I knew this, the vitamix is servicible. Basically the jar is good for 50-100 uses and then it stops working correctly, leaks and then catastrophically fails. Not good for an expensive product. The design could relatively easily be changed to use a gasket and ring so the blades could be repaired or replaced.