I've had mine for a week now, and have been able to use it alongside my late-2014 rMBP, which has been a solid workhorse. I'm starting to notice very subtle preferences for the 2017 model creeping in - after an hour of typing, for example, going back to the old keyboard feels really, really inefficient and antiquated, and my typing rate is lower than on the new rMBP.
I also really enjoy the Touchbar - it hasn't been too intrusive, and binding ESCAPE to Caps Lock has been an acceptable re-configuration for me as a vim user.
Speed: okay, it seems slightly faster than the old machine, but then the old machine is 95% full while new-rMBP is not even 5% full yet, so .. no indexing hassles. (old-rMBP would often become unusable during Spotlight re-indexing..)
All in all, I'm happy with the upgrade - but with one huge big fat caveat: I didn't buy it. My work did. If it weren't for this fact, I'd be very reluctant to upgrade..
I also really enjoy the Touchbar - it hasn't been too intrusive, and binding ESCAPE to Caps Lock has been an acceptable re-configuration for me as a vim user.
Speed: okay, it seems slightly faster than the old machine, but then the old machine is 95% full while new-rMBP is not even 5% full yet, so .. no indexing hassles. (old-rMBP would often become unusable during Spotlight re-indexing..)
All in all, I'm happy with the upgrade - but with one huge big fat caveat: I didn't buy it. My work did. If it weren't for this fact, I'd be very reluctant to upgrade..