Are you Kidding me??????? they are simply one of the BEST additions to the game..
You're forgetting several things, mr jones.
1) He's got an asp, not a corvette. If the booster were only available for the conda and asp, would it remain BEST EVAH!? No.
2) He doesn't know what it's for. It's for the ships with very low range, for which 10LY extra can be nearly 100%, the figure they were thinking of
3) Even for low range ships, if you fit them for exporation rather than combat, the boosters are kinda lame. Gets silly when you try a courier, since the extra weight is a bigger delta than any other ships, "nerfing" the increase most.
The boosters ARE brilliant. FOR COMBAT SHIPS IN COMBAT BUiLDS.
Soooo many FDL ganklads were really adamant that the ships were unbalanced because their combat ships could barely jump, even with engineering. Rather than gimp the explorer class for the sake of the noisy, they put a flat increase module for internals.
The OP is serious. Stop knowing what you know, start thinking what the OP might know. It's kinda lame for explorer ships compared to the hype from those in combat specialist ships. It's not proffered to be only special for that build, and "pro" explorers add it anyway, so if you don't know better, it sounds like it's a gamechanger for explorers too.