Coming from a Linksys E4200, the Dlink 857 works quite well. Have had it for 3weeks and have put it thru it's paces. Out of the box the 1.00 F/W saw my Seagate 3TB HDD connected via the 3.0 USB and the Shareport app (The app just updated today) on all my devices was able to access the drive FAST and snappy...impressive.
The dual band works great with all my wireless devices ie..iphone, iPad 3 , 5GHZ lappie and 4 Dlink wireless cams, and XBOX!!!!!
DLNA service works GREAT!!! The PS3 streams all my video content, gonna have to rip some HD content soon

The wireless coverage is by far better than the E4200 both on the 2.4 & 5GHZ bandwidth, solid signal and less instability.
After the release of 1.01 F/W I waited a day and took the plunge and upgraded the F/W and the upgrade process went smoothly and all my configurations were there on reboot.
All in all a great router should have waited 1 year , had I known Dlink was gonna release this router I would have. Would have been worth the wait.