Performance wise, how much % more powerful is the 28w compared to the 15w. I presume there would be a similar performance gap as per previous generations Air vs 13" rMBP? The base model is very tempting for me, but when you look to upgrade it to 16gb RAM/512gb hard drive, it doesn't seem value for money to not just opt for the rMB 13" with touch-bar, as although you may not need the touch bar, you do in addition get two further ports and a more powerful 28w CPU for just a bit more. Looking at reviews for the new non-touch bar rMBP, people are getting around 10-11 hours of battery life. I am trying to estimate if the touch-bar model will have battery issues due to - Having a lower capacity battery at 49kwh, vs the 56kwh of the non-touch bar - Having to power a more powerful 28w CPU, which runs at a 2.9 ghz at core, vs 2.0 ghz of the non-touch. - Running more faster RAM (2133 mhz vs 1866 mhz) - Having to power the touch-bar - The more powerful Intel Iris 550 GPU I am getting concerned that the battery might crap out at around 6-7 hours due to these additional factors. Granting this isn't horrible battery, but this means, should I do anything a bit more intensive, battery life might only be 2-3 hours, which is concerning. The non-touch bar in the same scenario (a bit more intensive) might get 5-6 hours. This is making me lean to either just getting the base rMBP, or take the £££ hit to upgrade the base rMBP to 16gb RAM / 512gb SSD. Or I could just buy the base, sell on in 1-2 years and get a revised version of one of the rMBP's. What do you guys think? Of course no one can say for sure what it will be without having used it first, but we can make rational judgement based on quoted battery capacity and having used the non-touch bar version.