Aww that's junk. You can't use the ad card as a external save as every time you disconnect the display you loose the sd card.
If the SP4 drains battery at random when in sleep mode, and routinely fails to wake from sleep or hibernate, and has intermittent errors when attaching and detaching the keyboard, then it's pretty much the same as the SB.
but I don't see why I should have todo that
The sleep/hibernate issue continues to be a major issue for me. I could shut it down every time I walk away from it, but I don't see why I should have to do that - especially when MS boasted about the phenomenal sleep/battery management on this expensive machine. I don't get many other errors, but there are people on this forum who are still reporting DD errors and attach/detach errors.