i have ridden them.

you won't find the graphene tires to last appreciably longer than the prior non-graphene compounds.

i'm ok with this and basically ride nice tires all the time because i get pretty good deals and i feel that tires make SUCH a huge impact on my overall ride experience. life is too short to ride crappy tires.

(i'd feel differently if i rode ****ty roads routinely and had to deal with stuff that can quickly flat a tire; i'm lucky in that i basically wear out tires rather than tearing them up.)