I just got a Hopper With Sling today, and the wifi situation has been a bit odd.  First, I was getting some breakups the first time I tried watching video with the Dish Anywhere app on my tablet.  The wifi signal strength is around 53.  I don't know whether that's good or not, although the strength bar was green.  But anyway, I can't do any better since the wifi antenna is internal.  (STUPID move, Dish!  And does anybody know exactly where -- in the metal box! -- the antenna is located?)  Later, I tried accessing the apps, and all I got was a blank screen, even though I had accessed the apps once before and everything worked.  In retrospect, I wonder if the wifi connection was down and I just didn't know it.  Finally, I managed to crash the HWS (unplugged an EHD -- does this happen every time you do that?  I haven't tried to repeat it yet) and when it came back up, the wifi wasn't enabled and I had to go set it up again.  (Will I have to do this every time the receiver goes down, i.e. for a power failure?)