Pros: Stylish, reliable, quick, and fun.
Cons: More expensive (but worth it in my opinion) than many other scooters.
I have a lot of experience with the Vespa ET4---it is quite simply a fantastic machine. Stylish, reliable, quick, and fun! I now own a 2006 Vespa LX150 which replaces the ET4. It has all the features of its predecessor with some new styling.
The LX150 has a top speed of a little over 60 MPH on the flat with no wind. I weigh 190 pounds so if you weigh less you will get some more speed. In practical use 55 MPH is a more reasonable cruising speed, adequate for almost all surface or secondary roads. I ride my scooter year round in sun, rain, and snow.
If you want more information on this Vespa or on the joys of riding check out my blog---Scooter in the Sticks.