Just be sure to fully exercise the batteries in both machines before you make a final decision. regardless of what people say about LI being ready at birth it's not true. Users show gains with LI after using them a few times. Just something to keep in mind. I have read alot of users getting more than 6-7 with the TB model too. I am reserving judgement until I have spent a week or two with this machine.
I Definitely will give it time. It will most likely be a week side by side. That price match is probably going to contribute a great deal to my decision though. A $300 difference isn't bad, but a $500 difference is pretty significant at these price points.