I just installed the Hondaline grips, and I would use another option if I had it to do over again. Its ridiculous that Honda makes you buy three separate, overpriced, parts/kits to complete the job. Still, I decided to try Honda for a cleaner installation. But as Rmcapozzi pointed out, you end up with a mass of bullet connectors right at the base of the handlebar. I wrapped mine in electrical tape just to finish the job, and it doesn't look too bad, but I could have saved money and probably done a cleaner connection using after market grips.
I had a minor wiring problem with the install. At first I got no action from the controller, and spent some time checking for power with a test light. Then, I reversed two bullet connectors for the controller, and that solved the problem. I don't think the instructions were clear on which color wires needed to be connected. Apparently no harm done.
Also, personally I don't like the controller on the right side. You either have to take your hand off the throttle, or cross your left hand over to change the setting.
That said, they do work well and apparently they last, based on comments in this forum.