It is interesting to note all the performance issues.
For me, CPU usage etc is not the key issue. Perhaps because my music will use 16, 20 tracks max
The big claim for BW is the workflow improvements. That's a more difficult claim to evaluate, partly because it takes a while to get used to new kit, and partly because workflow judgements are more SUBJECTIVE
At the moment, with BW, I can see lots of nice things e.g. about MIDI editing. But on BW I lose all the investments I have made with Live - customized MIDI controllers, STC, Tom's Push mapping - hell, even Funken's Mac Shortcuts for the Fourth Workers' International

... And the switching between the different views all feels very un-intuitive still. So I am not an unbiased judge.
I guess those issues will only be revealed with time.