Since the owner's manual recommends not exceeding 4000 rpm until the scooter has 600 miles on the odometer, I have not had the scooter over 53 miles per hour.

I test rode a Silverwing and a Majesty scooter before choosing the TMAX. My criterion for selecting this scooter was as follows:
* Good commuter to/from work
* Good fuel mileage
* Good wind protection for highway touring
* Enough power to keep up with cars and accelerate to pass
* Good for two up riding (rider and passenger)
* High quality materials and construction
* Handles and brakes like a sport bike or at least a sporty motorcycle
* Low engine vibration and noise
* Storage under the seat and the option to add a trunk

I believe I have found the right scooter for me in the TMAX. The only areas that Yamaha should consider improving (so far) are the suspension and lack of a lockable glove box. The suspension is somewhat firm, so I tend to avoid bumps in the road. I assume that the suspension is designed for sporty riding, but it would be nice if it was adjustable. Neither glove box has a lock.

In addition to the scooter matching my requirements, I can mention these positive points:
* Good throttle response. The scooter takes off without hesitation.
* Comfortable riding ergonomics, although the seat is a little high. I cannot put my feet flat on the ground at a stop.
* Very smooth engine. Mirrors are clear on the highway.
* Very light and flickable in turns.
* Brakes are very strong and only require a light touch to stop the scooter.