It is a bit hard to tell if this thread was intended for only the pro version or the normal one as well. In any case I just bought a Lenovo Yoga Tablet 2 10" with windows and I'm loving it. The battery life of this thing is insane, the 15h promise is no problem, last charge I had well over 18h. Also the speed of the z3745 chip is more then enough for tablet use, it can even cope with older games and Steam's in-home streaming works like a charm on it. Running office is no issue, neither is lighter workloads of any kind. Only with very memory intensive tasks or very high CPU loads will it slow down, but to be fair you would only run into that if you use it as a full desktop replacement. As a tablet its perfect.
I looked into getting a surface, either a first gen or second gen, but the size and weight of them coupled with much less battery life made me reconsider my personal need for higher performance then the yoga. As for third gen Surface they are twice as expensive as the yoga, and that's the entry i3 version. The yoga is very nice to handle and the kick stand/flip stand is great. I'm having a hard time finding anything to complain over to be honest. Well one thing would be the on/off switch on the keyboard, its very difficult to reach and very hard to move.