D
Droopy
Monty and sigmas are far to bulky. The rubi is a machine of finesse.
A 630mm Sigma is probably less bulky than even a TS600, nevermind the TX range.
The only Rubi I have that I like is the TX. The TS, and TS+, are nowhere near as good as my Sigmas.
But I have to say, after seeing Lee from Rubi demostrate the new TI range, if I were to buy a new cutter tomorrow it would be the TI.
Very much like the Sigma, but with a wee bit more thought put into it.