Are Yamaha Aerox good scooters?

I was looking around at Yamaha aerox scooters on you tube etc and i see you can get them in both 50cc and 70cc i presume the 70cc ones have a new cylinder put on them which were once both as 50cc also how hard is it to make a 50cc to a 70cc and would it cost alot. Can you also tell me do you know if they are reliable etc and can you store a full face helmet under the seat. Also are they light and fast as i don't want a heavy scooter. Also do you know what colours they come in i was looking at the Rossi one as i really like blue. Thanks for answering. Also can you tell me do they come with an electric start as i see in you tube videos the people kick start them all. Thanks for answering i will pick best answer.
 
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