We have a 2008 Goldwing Trike with a Lehman kit. I strongly recommend the Lehman Kit, but ensure that you have the front raked, cruise control and reverse. If you are in a cold climate I suggest the heated seats and handle bars. In addition, have the air wings put on it because there is alot of heat blowing on you from the engine that sits right in the front. The heat is great if you do winter driving but the summers are killers, smile.
However, bare this in mind, the overall decision as to which kit you should go with is determined by which kits a dealer works on in your area. What I mean is, it makes no since to purchase a Lehman Kit if the repair shop is 300 miles away. In addition, the areas that you travel mostly, what business work on the kit you have.
Just offering my advice in this area.