Hello,
I've just sold my LX 50 (fifthy) and bought a LX 150.
The power (compared to the 50cc) is amazing. It is actually a lot quicker than cars (in city traffic) and pulled in no time to 110 km/h / 65 mph.
The reason I had to drive a 50cc was that we need a real motorcycle license to drive something bigger than 50cc. (that takes about 6 months of driving lessons).
I've sold my LX 50 for the same price a got the 150 for. And the 150 has half the mileage (3700km/ 2200 miles).
The 150 makes me happy