A 15 hour battery life should be interesting :O. Imagine when tablets can go for a few days without charging. Although solid 15 hrs of video playback / internet surfing would be amazing, I think if it can reach 11-12 hours of heavy use or better with less use, TF2 will shake up the tablet market again. My best friend is a supervisor at Best Buy and says typically people either buy the Transformer if they play around with it or an ipad, and the rest are sold rarely.
Asus shook up the netbook market, and the first asus netbooks had tiny screens + keyboards and mediocre performance, but their followup generations seemed to improve each time.