I'm moving towards the city centre, to the Dufferin/College area. Bixi, given its small zone, is almost useless to me, I'd rather take my chances with my own bicycle that\s set up for my frame. That said, Bixi Toronto, with a larger service zone (say Pape to Roncy to St. Clair) would be a huge success if going by Montreal standards. There's a major Bixi hub at Jean-Talon Market, which is about as far from the financial core of Montreal as say Wychwood Barns is to Toronto's. Wychwood Barns would be a very popular hub.
So, no, I won't sign up, though I would have considered it if it were a larger zone. I think hubs at the Ward's and Hanlan's docks at the islands would work great, as there's a Bixi hub at Jean-Drapeau Station on Ile-Ste-Helene that allowed me to bike around Montreal and finally visit Habitat 67 in person last summer.
Yes, the Montreal Bixi bikes are very sturdy and tamper-proof. Which means they are heavy, and only have 3 gears.