I have a 2006 Kymco Bet and Win 250 that we've had since new. Been rock solid (and it hasn't been babied, it gets stored outside most of the time, gets driven on cottage roads, etc.) It'll go on the highway when I need it to, and I've done 800km's in a day on it. Great scooter.
Only ever tried the Xciting 500 - not the 250 - but the 500 was a great machine as well. (Drove one setup as a sidecar tug, worked great for that.)
For reliability - I'd rank Kymco right up there with any of the big name manufacturers. I go on the Mad Bastard Scooter rally every 2 years - 800km in a 24 hour period. Generally a good chunk of the scooters are Kymco (They sponsor the event) and I can't remember a single one of them ever not making it.
Member, Canadian Sidecar Owners Club (CSOC)
Member, CURD (Canadian Ural Dnepr Riders)