Can't remember how I came across this, but wanted to know if anybody thought it was worth doing. Not 100% sure exactly what it consists of, sounds like a plug that you shove down your seat tube on your frame, which immediately causes problems for us lot. In theory its a good idea in my opinion, for those (like myself) who can't really afford bike insurence but still, for want of a better phrase, poo themselves about their bike getting stolen. Don't know what they mean by solid and split frames though? Link to their website, section regarding bikes is about half way down the page.