I got the 2.7/8/256 model a couple weeks ago and am loving it. I was replacing a 2008 15" MBP, and I spent a long time researching what to get. I was pretty sure I'd go for a refurbished 2014 13" rMBP, but the Force Touch trackpad, faster graphics, and especially the support for a 4K display at 60 Hz made me decide to spend the extra money for the 2015 model. I have no regrets.
As others have said, the trackpad click feels completely real. I haven't thrown anything heavy at the computer yet, but it hasn't yet gotten more than lukewarm, whereas my 2008 MBP was hot pretty much all the time. I haven't measured battery life, but it recharges very quickly -- much, much more quickly than my iPad 4. It's so light and portable compared to my 2008 MBP that I can't imagine wanting a MBA at the expense of the Retina display, let alone the forthcoming Retina MacBook at the expense of ports and power.
My main computer for the past two years has been a late-2012 Mac mini i7. It's a great computer, but I really wanted the portability of another MBP. I'm trying to decide whether to sell it or keep it as a backup computer and media server. I also want to get a 4K monitor, and I'm trying to decide whether to go for the Dell P2715Q (which currently can be had for $550) or wait for more choices to become available.