In three-to-five-foot waves, the 500 Express ran smoothly, whether in a cross-sea, quartering sea, or downsea, at speeds to 30 mph. Running upwind in the same conditions required that I tab down and throttle back to 23 mph to maintain comfort. That's still quick, even for a boat this size. When the seas got rougher, I discovered that the 500 Express remained on plane and maneuverable at an enviable 12 mph, tabs fully deployed. By comparison, Sea Ray's 500 Sundancer fell off plane at 15 mph when I tested it, but it had smaller 635-bhp Cummins QSM-11 diesels turning smaller props through higher gear ratios, which results in less torque. Note that the 500 Sundancer is a foot longer but 1,000 pounds lighter. And with the optional 670-bhp MAN diesels, the 500 Sundancer ($949,541) likely will hold plane at a lower speed. So even though the comparison isn't completely equivalent-more like Macintosh to Red Delicious-the fact remains: The 500 Express stays on plane at the lowest speed of any express cruiser I've tested.