I have a Kymco Super 8 150 as well as an Aprilia Sport City 250. I use the Kymco mostly around town and the Aprilia for longer trips. I did an 8 state 2100 mile trip on the 250 so 250cc is certainly big enough for long rides.
My Kymco has not broken down in 2 years and 9200+ miles but have had some problems. Kymcos do tend to have fairly short maintenance intervals so you will need to tinker with it a lot. If you don't do most of your own servicing, scooters end up costing more to operate than you would think.
The GV 250 has a very cramped riding position so unless you are pretty short you may not be comfortable on it. I have ridden the Xciting 250. It is fairly big and heavy for a 250 but was reasonably comfortable. If you can get a really good deal on one of them, get the one you are most comfortable on and go for it.
Also, make sure there is another Kymco dealer in the area so you can get parts and service if you need it.
Having owned a Kymco for over 2 years I wouldn't hesitate to get another one.
I ride, Therefore I Am.