The only advantage I can really see is that you get the bike back, don't have to inform the Insurance so they don't double your next premium as overnight you have become "high risk"
But thats the gamble, TBH if my bike was nicked I am not sure I want it back after some toerag knows where it is kept and its not my sole form of transport, still on the fence, but it really is a lot of money for no recognition from the insurers which seems bizarre.
Seems more reasonable
http://www.trackerdirect.co.uk/