They have had a few slides on them, the bottom one is slightly coned by only by a few mm.
If you using these for just general longboarding then they are sweet as, they are no less grippy than when i first got them and still roll true (no flat spots) and nice. They are the original formula which in my opinion is better for cruising around on because they seem to like rougher pavement more than the new black ops
otherwise i have a set of Orangatang In Heats 83a that i have lathed down to 65mm... i have no idea how these ride but the edges are sharp and good as new, they arent 100% flat but pretty close to it, i'd say 98.9% flat but after a few rolls and a few slides they should even out. $30