I own an 04 Scarabeo 500 and often ride the highways with it. I'm 5'11" and 190 and the seat is extremely comfortable and I've done many 300 + miles on it with no discomfort. Suspension is extremely good and absorbs potholes with ease so I was surprised by his comments about the suspension. I would think adjustments would be in order. I can do 75 mph all day with no problems. Top speed is 95 mph. This is a quick and nimble scoot and handles very nicely. As he indicated, top case is very big and the two panniers are sizeable, as well. Lots of storage for small items is in the front under the handlebars in two different locations. I especially like the 16 inch tires as I find its weight and profile good enough to handle the dreaded semi which can do some damage to a smaller scoot. Finally, I get 55 to 60 miles per gallon. the 04 has a 5.3 gallon tank so I'm good for many a mile. There is something about the automatic "twist and go" that's so fun. I use it for all my local trips.
I also have an 06 BMW 1200 RT and frankly, as much as I love the Beemer, this scooter creates much more conversation whenever I take it out.
Bruce