I never used one of those foamy things so I cant comment on them.
In my previous car (volvo) I had a blow out in Devon, and it was a real pain poolding at 50mph for 100 miles. Since that time I always carry a full size spare.
I also had a blow out with the same Volvo on the Spanish border (I reversed into the toll gate curb, dont ask). It was such a relief to have a full size spare.
Also with the S8 I had damaged tyre in Lyon (bulging sidewall) and again such a relief to have a full size spare and worry free journey back to the UK.
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