Usually only takes one their first time out on the free way riding a small displacement scooter. That first bump you hit at 60 mph, then the scramble to get off on the next exit....
That hasn't been my experience. My first time riding a scooter was a rental Yamaha Riva 125 in Hawaii. The Riva is even smaller and lighter than the Like 150 (209 Lbs and 49" wheelbase) and had tiny 10" wheels. I accidentally got on the highway with my wife on the back so I pinned the throttle and kept up with traffic at an indicated 65 MPH until the next exit. No drama, it was perfectly stable.
My Super 8 is about the same size and weight as the Like and it's perfectly smooth and stable at top speed and I have done short blasts on the intestate with it. If it had a few more HP and would go another 10 MPH I wouldn't hesitate to do that.
My Smax, which was a little bigger and heavier was perfectly happy running 70+ on the interstate.
Light weight and short wheelbase do not make a bike unstable. My super 8 is much smaller and lighter than my Majesty but is more stable in windy conditions.
The owner of Cleveland Moto claimed he saw 71 MPH on a Like 150i on the interstate. He claimed that GPS showed the Speedo to be dead on accurate. That's the only report I have seen so far. Someone on ADV claimed his speedo read a little high but since the scooter is new he hasn't run it up to top speed yet.
I am not buying a small scooter to ride on the interstate but it's nice to have the ability to do it once in a while for a short distance.