Get anything other than a basic puncture and the gel will not work so for peace of mind I have a spare (350 spacesaver) and jack/handle that fit in the spaces provided and the Bose unit fits neatly inside the spacesaver. Spacers needed at front to clear the larger 370 calipers but as I have these to give the car a better stance - job done there
Yeah, it adds a bit more weight but peace of mind, especially if in a weak mobile signal area, matters more to me.