Depends on tank length. A short drop lets you use a longer tank than you'd be able to use with out one. Flip it around and you can use a shorter tank than you'd normally be comfortable with.
Posture comes into it as well. If all you play is that stereotypical speedball "power stance" where you're leaning way forward with a hunch back and your head way in front of your chest and shoulders, then no, a drop DEFINITELY is not for you. But if you play upright, or leaning slightly back...say to get behind tall thin cover, like a tree or single hyperball tube... you might need a much shorter setup than a simple bottom line can provide.
And if you do that super old school "Z formation" where you're kneeling and leaning so far back that your head is now behind your feet, well you might just need the uberdrop.
David Johnson, AKA Fubarius.
Nunquam emere potes facere