I can attest to Mark Biggers' Cathouse up in Saginaw, MI. We bought a used Nacra 5.8na there in 200. We took the time to drive up from Chicago to his place to pick up the boat. Our boat, as advertised, was in absolutely excellent condition and extremely well fine-tuned for racing (having been owned by a racing couple who switched to an I-20). To this day, we are very happy with the boat that is very fast, and in certain moderate wind conditions has outsailed a Tiger, a Tornado, and a Nacra 6.0 (not na, though, but an Euro rig), We are no racers, but we love the boat for recreational sailing.