You may also like to check out the Ortovox S1. My wife bought one for me this fall and I love it. Extremely easy to use, be it single or multiple burials. I also have an S.O.S. beacon that I took my avalanche training with and feel very proficient using. However, it does not come close to the ease of use and the speed at which you can locate a victim with the S1. Rather than relying on a flashing row of L.E.D.'s, it actually shows you the victims on a screen (up to 4 at a time) and tells you how many meters you are away from each victim. Unless you're a complete idiot, the S1 will pretty much take you by the hand and lead you to the victim, It has one feature that I really like now, but didn't think about until the terrible tragedy near Fernie. If it does not detect movement for 90 seconds, it automatically switches back from "receive" to "transmit". So if you are searching for burial victims and a second slide hits you, the S1 will switch back and start transmitting so other rescuers can have a chance of locating you.
