I'ts pretty simple. There's a sender and a receiver unit. The tiny sender unit connects to the Surround left/right speaker-level connections on your receiver and transmits the signals for the rear speakers to the receiver unit using the 2,4ghz band. The surround speakers stay connected to the receiver unit with speaker wire. The sender and receiver link automatically. The receiver unit has its own volume control to determine maximum output (I turned mine all the way up). it's a good idea to re-run your receiver's room correction software once you set up the wireless kit. If your receiver lacks room correction then try adjusting delay about ~20ms or so and/or double the distance to compensate for the slight latency the kit may introduce.
it can transmit audio up to CD quality, so it generally sounds fine. It can be prone to interference or dropouts depending on what else is running on 2.4ghz in your house. I never relaly had a problem with it when I was using the kit to power a pair of Energy CB-5s as rears. I also set up a system using the kit powering Klipsch KS-14s and it sounded fine, although it can sound a tad harsh at higher volumes. I wouldn't use it power speakers of average sensitivity that require good amount of power. You have to keep in mind it uses a class D amplifier that tops out at 30 WPC @ <10% THD.
ht Panasonic 60" ZT60, Monitor Audio: Silver RX6, RX Centre, Radius 90HD; Martinlogan Dynamo 700, Marantz SR5006, PS3, Oppo BDP-103D
2ch Sony KDL-32W650A, Sony BDP-S1000ES, Marantz PM8004, JVC T-X3 tuner, Monitor Audio Silver RX1, REL T3, Apple TV, Peachtree Audio DAC•iT, Sennheiser HD598
lr Panasonic 50" ST60, Sony BDP-S5100, Apple TV
pc Energy CB-5, Audioengine D1, FiiO A1