I have a 1999 with HP500s and love the ride. I would not get one if it didn't have canopies. They make the ride so much nicer. My cruises between 60 - 65 around 3200 - 3500 and its like sitting in my living room. It also keeps the drives in the water. It has a lope between 70 - 80 but just drive through it and it runs like its on rails over 80. They are great boats for the money and hold up pretty well. I do not know anything about the 600s. Good luck and call Jay at Spectre, he is very reachable and has always helped me when I called.