I bought the ARTs based solely on spressos review. no online ordering AFAIK, you need to talk with ART, they are made to order. Also, you need some lead time for the same reason, took mine a >month to get here, which was fine for me as i was in no hurry. i also ordered the porterfield pads, and had stainless lines made locally. the truck stops pretty well, no complaints at all. but my truck is not loaded down, it is in fact lighter than stock since i've removed the third row seats. i made the move to HD braking because i am towing a little bit and i wanted the best braking that i could get. when towing, they are still just fine.
when i'm not towing, i figure the OEMs would have been fine too. mine were warped, otherwise i would have waited longer and towed some with the OEMs before deciding to upgrade.
OTOH, if spresso got nearly 100k (?) from his ARTs, i will probably never need to pay attention to my braking system again