I had the same concerns but a key without a transponder coded to the ecu will only allow access into the car triggering the alarm unless its been disarmed again with the coded transponder. I rarely if ever keep anything of value in the car so the convenience out weighed the potential loss of a 3 month old bag of Wurthers toffees. I didn't want my post to come across as an ad or imply that I have any sort of a connection to the ebay seller or sinister ulterior motive.The ebay business he runs is run along side another web site http://www.keysinthepost.com/, I looked into the sellers feedback to see if any buyers had security issues but not a single negative comment from 2337 happy punters, only after weighing it all up did I decide to purchase.
I've been a long time browser of the forum and thought it might help a few people out on the site as I know how many keys I have snapped myself and how many other owners have found themselves in the same situation with the key always breaking at the weak point at the top of the blade.