They're fantastic. I think either with the economy people can't afford them anymore, or had big upgrading plans and can't afford to do that any more. Who knows. I think they're great pumps, and most if not all owners of them think they're great as well. I personally would buy Tunze 6100s if I could, but only because you can buy a pair of them them used with a controller for around $400-$450 shipped, versus a new Vortech with a controller for $420 each. The vortechs are better apples to apples, but for the price, I'd be willing to settle on the 6100s if I could afford them at all.