Sadly, i may have to return my router. Speeds are great, but my phone can't stay connected to the 5 ghz band (could very well be a phone issue from what i've read) I actually had to disable it because my phone was dropping wifi on the 2.4 band as well. Turning off the 5 seems to have cleared that up for the most part ( it did drop it again tonight during a speedtest) I've tried multiple channels, channel widths, etc. using a wifi analyzer as my guide to picking the best ones. (least used/congested)
My connection also took a dump tonight on the PC. This happend with my old router as well, so it could just be a problem with comcasts modem communicating with my router. I've had issues with Comcast equipment in the past. I have until Jan 16th, so i'll give it a good testing before deciding.
Finding a good router seems like a major PITA. Every router in my price range seems to be hit or miss. (based on reviews)