So far no problems. I just had my wife connect her phone to it and it appears that both of us can have the APP and share the bike. I was a bit concerned about this but it seems to be fine.
I also see Zoli has a good report for the Urban. I was looking at the different app modes and they look very impressive with so many useful features for the rider. Sounds like it is also a good idea to test COBI with 2 different phones allowing each user to personalize their settings.