I've been following this thread since it started, and that TT250 is really starting to grow on me. I've always been skeptical of the Chinese bike's build quality, but it does appear the quality has greatly improved since those types of bikes started showing up 15 years ago. Maintenance wouldn't be a problem for me as long as replacement parts and filters are available.
I've really been wanting a smaller displacement dual sport/supermoto. Something that can can get me around bumper to bumper traffic, and be able to take up to the mountains and ride all the dirt roads and OHV trails my heart desires. My biggest concern would be high altitude running, say 12,000 + feet above sea level. It appears the TT is equipped with a carb, it doesn't say what style tho. If it's a CV carb, it would probably be fine. If not, it might limit me to staying under 10,000'.
Dan, do you know any details on the carb performance of the TT250?