As long as I shut-down completely I have no battery drain. So I'm thoroughly enjoying my Surface Book. It will be nice to get the "sleep" fix, but that fixes only a very minor inconvenience for me.
Please keep in mind Gary that you said you never shutdown your SB for more than 10 hours at a time, so technically, you may also experience battery drain after 24 hours of shutdown, you just haven't had a chance to experience that yet. I know you said you use the SB too much for a 24 hour test, but if you ever have a down weekend, I would love to know what happens with your SB after 24 hours like the rest of us with the issue.