I ride them on a couple of bikes and I like them quite a bit. I've always picked them up on some kind of discount though. I suspect the reason they are on closeout now is that Conti has decided to discontinue them just like the GP3000. I also doubt they ever really caught on and I'd suspect their sales were low. Just like every other product they have a lifetime.

At the prices I'm seeing ($49 per pair) I think they a pretty good deal.