Ha! Mine was under 3 hours at 98% battery. Freaked me out but it balanced out after a bit of use. At one point it gave me 11+ hours after a full charge.I'm quite happy with how drama free it's been.
Runs fairly great on my late 2013 15" rMBP. There's a slight performance hit, some animations just aren't as silky smooth as mavericks was, but it's generally fine.
I was alarmed at first because my battery time was only 4 hours at boot, but it resolved itself over the next half an hour and the time went back to 7+ hours. Guess the system had to figure it all out again.