I'm having serious troubles with the power button lag as well. This is pretty unacceptable by my standards. I have hard reset the device twice, soft reset at least 10 times, had 3 brick scares where the device wouldn't respond to a power button click at all (each rectified by a soft reset), and countless instances of a delayed response. Hopefully this can get fixed. As a side note, I just received a replacement for earlier issues with WiFi and random reboots under 8, and my volume rocker is not secure and I can watch and hear it shake. Does anyone think I would be able to ask for another replacement from Verizon without any troubles (seeing as 8.1 is not officially released by Verizon)?