i have an Apex and its one of the greatest things ever. i never use the curve or anything but the distance and accuracy bonus is great. i can shoot a football field on a day with not much wind.
i would also recommend a python barrel kit. its made for woodsball and it's around 2 inches long and attaches to the end of the marker and whatever barrel you want on the other end. it has inserts to match the balls you use and really tightens up accuracy, especially at long ranges...