It handles very nicely. You can take turns no problem... the trailer just leans with the bike. You can go over speed bumps, but you should slow down a lot. I have gone fast over a bump in the road (caused by tree root) and you can feel the trailer bounce up and down slightly. After that I was more careful.
They are very reliable and are very feasible for city use.... they are illegal if you have anything over 50cc, but you can easily put some huge engines on a trailer with tons of power... that is the main advantage... and the simplicity of the build.