Im still on my 1st set of tires after 10000klm , i have carefully thought it through as to which way i will go once i need to replace at least the rear in the next 5-6000 klm. The car tire has the attraction of being cheaper and lasting longer and i also spend a good deal of time riding in the verge to get around traffic jams on my 100klm each way trudge to work , so far i have had one puncture and i assume the softness of bike tires lends itself to easily being punctured by all manner of crud that gets thrown onto the verge , so the car tires resillence to punctures is a plus.
What isnt a plus to me is the news that Triumph will void my warranty on a 2 1/2 mth old bike for having a car tire on and my insurace would be equal to ***all if i get involved in an accident, so at the end of the day i think i'll stick with the bike tire and try one of the aformentioned brands to see how long they last