I have a friend that has a side car rig (she does take it on and off occasionally - and is waiting for the day that she doesn't have to have it to cart 2 kids around with so she can get rid of it). I think its actually harder to ride in some ways - you have to muscle it around a lot more than on 2 wheels. Also, if there isn't enough weight in the sidecar, it will come up off the ground and can kinda pull the bike around some. It also makes the bike suck the gas! Have to be careful you don't run out!
But that is a sweet looking rig.
Becky