I have played Jumbo Java on Alto and Tenor for years.
I recently switched it out for a Vintage HR Otto Link (the new one) for one reason, more control. I felt like I never learned enough about this. it's not that I won't return to a JJ on Tenor as I love the range (expression, volumne, effects) it gives me, but I want to spend a little time on an Otto link HR. I did try Otto Metal, but just never felt it was for me.
For Alto, I don't think I will ever leave JJ. it just give me great control on the lower end of an alto. I rarely go over E3 on alto. (Not the best control in the upper range, fight the urge to go sharpe)
So to experience power, I would suggest JJ to any player. Just remember it's called music, and it's your job to play musical. Just cause your parents give you the keys to the car, donesn't mean you drive it off a cliff. Repect the power.