Its been 1.6 years since I own a YAMAHA SZR its a zero maintenance bike I say for city rider with low speed
Positive:
Good mileage in City(50 Kmpl In city and 55 in Highway)
Stylish bike for Youngsters
Since its YAMAHA pretty strong engine and gear system
Maximum Speed of 65 KPH is advisable for smooth ride
Negative:
No star for Braking as it is not having any kind of balance while braking in the roads, in fact I have met with accident twice because of the braking system
Creates weird noise when you travel in maximum speed
For long journey no never you will get back pain definitely
for 153 cc class the horse power should have been more, which makes the Gearless scooters to be competitor for the guy in the roads
after all the above said words I would reccommend the bike only for city use and not for long ride or the riders who likes power in the road