I agree with T_glick.
I've had my 15" since late November. Initially I couldn't make any sense of the battery estimates. But over the last few days they seem to be settling down.
I have not done any kind of re-install or reset. Just the original machine install, out of the box, loaded my apps and data.
I'd say that I'm getting mostly consistent estimates now, with usage of no more than (and sometimes less than) 10% per hour, which gives me at least 10 hours endurance. I've run the machine down and it's a real 10 hours, thereabouts.
I'm almost getting the same endurance with a VM running Windows along side normal Mac operations. If it had done that on day one I'd have been very happy.
It's not 100% consistent, but it looks like it's getting better. Maybe that's pure luck. Maybe it will all go south again. I'd say there is still something strange with the estimates, though. Recently I did get a very low estimate of 2 hours (just after a full charge) but 6 hours later it still said 2 hours.
Is it that this whole thing is just down to a really sloppy estimating algorithm that takes too long to get a grip on the battery performance, giving out incorrect and worrying estimates, before maybe settling down?
I'm not totally convinced of this, but starting to lean this way....