Rossi vs Webra
I originally started with the Rossi on an Aeron profile (R45). It weighed WAY-WAY TOO MUCH! It had good power and godd transition. The Rossi casing is the size of a 60 or larger. I see the power to weight ratio calculations above, and all I've got to say is I went back to the Webra 50. The Webra outperformed the Rossi hands down, and this was on the same aircraft. I dumped the Rossi, and was damn glad to get rid of it!
(Needless to say - this is my personal experience and opinion).
How does the Webras last you ask - I have 5 -6 of them. My oldest is about 5 years old with load knows how much time on it.
Regarding adding TT to the list, let me put it this way - I'd take the TT 46 PRO in a heartbeat over the Rossi.