Bad: My docs still has no cover flow
I can't say I've ever had wifi problems. My network is WPA2 and I notice with 1.5 it connects in about 2 seconds whereas 1.4.1 took about 45.
Bad: Shelves aren't exposed anywhere so calibre won't be able to support them
Bad: I've had this firmware on my nook less than half an hour and the reading app has crashed twice. While changing pages.
Also it seems to skip pages quite a bit, forcing me to have to go back and then forward for the correct page to show up. This was a problem in 1.4 but not quite as bad. This is using the buttons, not swiping.