fofa, I agree...
The point is that I don't want to go for a ride at 8 mph. That's not fun for me. Moreover, Montreal is an island with a large hill [a small mountain... an igneous magmatic intrusion, actually] in the middle. It is very difficult to ride in this city without climbing and I know that I would drop any bent on a climb. Just wouldn't be fun for me.
If you like bent, ride bent. I'm sure they're a blast; I'm not sure they go together with upright bikes any better than bents and landriders or upright bikes and mopeds...