There is really no need to get one of those programs. Most people think that a program they buy is going to have some secret exercise or set/rep scheme that is going to give them crazy gains...... not true.
Do you know what the secret is to getting vert? Getting strong (squat) and learning to display that strength quickly (explosive exercises), that's it, there's no way around it.
The hardest part is gaining strength because it takes a while, you can't get to a 2xbw squat in 4 months unless you are very gifted.
If you are weak then just focus mainly on strength right now (full squats) and do some jumping a few times a week, don't worry about the explosive exercises yet. Also make sure you are eating enough.
Btw, I've done vjb, jump manual, and programs created by adarq. Guess which one gave me the biggest gains by far and got me past plateaus.