I'm also curious if there are any models for which it works particularly well. For example, this one I have has rubber stays, and the beaker stays put so well that there is no danger to the glass. I can even press down a bit and it feels even more secure. However, I would think that the designer...
I have a 50th Anniversary Waring blender. I found it out in the trash and it works fine. It seemed to me a natural thing to turn the cloverleaf beaker over onto the rubber stays on the motor housing to let it drain and dry. However, I see no evidence from patents, marketing materials, Osius...