The first thing I noticed is the discomfort of the driver's seat. After about 50 - 75 miles, I have to stop, get off and rest my back. The design of the seat is different than most others. My Honda seat was much more comfortable. I could ride for hours with no discomfort.
The second item I noticed was the heat coming from the engine on the right side of the motorcycle. After about 50 miles of continuous riding, the heat to the right calf was almost unbearable. The dealer was able to reduce most of the heat with a Stage One Conversion for about $350.00. This opened up the exhaust more to vent more heat and install a larger air breather.
The next item is the handling of a three wheeler on two lane roads, in curves. Interstate travel at 70 mph is not too bad, but on country two lane roads, you have to be concerned with the tightness of the curves. Too fast in tight turns could cause mishaps.
The only other item appears to be the tightness of the suspension. The rear shocks are air adjustable, and I have tried various settings, but rough roads, bumps in the road, crossing RR tracks, changes in height going onto or coming off of a bridge, are very noticeable in the rear suspension, especially to the passenger. My wife is always hollering because of the shock.
The driver's seat is very uncomfortable, considering the overall cost of the motorcycle.
The heat problem with the exhaust on the right side should be rectified by HD.
The handling on curves is most likely common to all 3 wheelers.
The rear suspension needs improvement, possibly with springs in combo with the air shocks.
Overall, 3 wheelers are a good choice for the older generation with weaker leg muscles.