Wifi kind of sucks, but BT is great!
Wifi connectivity seems to not recover well when waking the device. In fact, i have to keep it from going to sleep when it's mounted on my dash in the car so i don't lose the wifi link from either my RAZR or MiFi while driving. i have WiFi sleep policy set to never and it still does it.
In regards to Bluetooth it's much better than my original Galaxy Tab, where when i tried to do music via BT to the car's stereo (BT FIPO adapter to 30-pin ipod dock adapter on car's cd changer input), plus connection to an OBDII Bluetooth adapter (Torque app) - it would have frequent stutters.
With this 7 Plus, i can be SIMULTANEOUSLY connected to both BT devices and switch between Spotify, Mortplayer, Navigation, Torque w/ no stuttering or lag. Also nice that now my car's steering wheel controls actually work better going through the BT on the FIPO to the ipod adapter (only track next/last toggle).
I wish Navigon and CoPilot didn't crash/lag so much, though.
Also the Stowaway folding bluetooth keyboard i used to use with my old UMPCs works well with this tablet.