Yes, they are Wifi. I haven't found any limitations in functionality vs a WS5 terminal. All POS functions, Manager Procedures, scripts and everything seem to run fine.
As for printing, for the tablet I went into User Workstations, Options and turn on "Enable Printer Destination Selection". Then for each printer, you go to Devices, Printer Definition and select "Printer Destination Selection" for each printer you want the tablet to be able to print to. When the server prints a receipt a dialog pops up with a list of available printers. That way they can select the one they are closest to in the building.
The only real limitation I've found is that servers can't use swipe cards to login so we assign them numbers. Since the testing has gone so well, we're looking at some more rugged tablets like the DLI-8800 that has stripe readers, barcode scanners and fingerprint scanners (since Micros now supports fingerprints for login).