I experienced two different issues with the tiller handle. The first issue I experienced was the way the tiller handle is secured to the engine base. There are two bolts that you tighten down on to the handle to secure it with. These two bolts “secure” the tiller handle in place by friction. They do not go through the handle to prevent it form twisting. The problem I encountered was when I was using the longtail to paddle the boat to turn it around. When I did so, the handle came loose, and I was no longer able to control the motor. After pulling the safety kill switch, I inspected the tiller handle and mount, you could see where the bolts had made a groove in the handle where it twisted in the mount. You can fix this problem by modifying your kit but I don’t think you should have to modify your kit to make it safe after you just paid $550 for it.
The other issue I have with the tiller handle is that it is awkward. You have a Z bent handle that sits tall and has a high profile. When you are standing and driving, it may be fine, but when you sit down, it is very uncomfortable and hard to maneuver. Especially if your kit is not riding correctly.