in my opinion the leg press is the most useless exercise thought of as it has very little effect on the vertical jump. It is not even worth doing considering you can do squats and deadlifts. there is belief that it is better for hypertrophy then squats and deadlifts but they are yet to completely prove that.
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it is very non fuctional and is more of an isolation exercise to the quads. you will make better mass gains focusing on compound exercises such as the deep squat and deadlift because they allow you to handle a lot of weight and work on almost all the main muscle groups.
see the leg press focuses on quads with no posterior chain activation. and the squat and deadlidt work every muscle in the posterior chain and anterrior chain which equals more mass due to the load you can use.
i have seen teens legpress as much as 1500 pounds at 10 percent or less bodyfat and still have lower that 30 inch verticals.
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get my programs as they are available.