Rate of climb is impressive, with the Supervan enjoying a 1,400 fpm maximum rate of climb at gross weight on a warm day, compared with the published figure of 800 fpm for the stock Caravan. We felt the improvements in takeoff roll and rate of climb going out of Lockhart too. Light on fuel but with five people aboard, we were off in a few hundred feet — the airport didn't feel necessary. A small field would have sufficed. Once airborne, I pulled the nose up, chasing the best rate of climb of 90 knots indicated, which gave us a rate of climb approaching 2,000 fpm on that day. Near sea level on a cool day on a 4,000-foot runway, the extra power was meaningless to us. Under marginal conditions, however, say on a very hot day at high altitude with a big load, it could make all the difference between being able to make a flight (or make it with breathable margins) or not.