I played around with the m3, 256gb in the Apple store and that thing is really capable and fast. Opened a youtube 2160p video playback, another 8 tabs, launched GarageBand, Pages, app store, iTunes and started changing tabs, messing around with everything. I didn't get the beach ball not even once. It was very snappy, very responsive. I was zooming in and out like crazy on Safari and didn't lag not even for a second.
And keep in mind that was the m3 version. Now I am seriously thinking of getting the m5/16gb/512gb.
Currently, I have a rMBP 13", 2015, I7, 16gb, 512gb (which is really, really powerful) but the slim design, compact size, and minuscule weight is winning me over. I also love the keyboard — I prefer it to the spongier feeling of my current rMBP.
That said, when at home, I do have it constantly connected to an external screen and I use at least one more USB. Don't know how comfortable I'll be with a single USB-C port but I guess there are adaptors out there to solve this.
My workload doesn't involve any video editing or anything else too demanding. I use chrome with tens of tabs open, a lot of writing and pretty much everything is browser based. That's why now with 16gb RAM I am completely covered.
Damn that thing is expensive though...£1729...
