I've heard the quality on their full drop-in gearboxes is quite high, although the consensus is you can usually buy similar or better upgrade parts and do it yourself (or have someone do it for you) for a lot less money. If the reinforced gearbox is necessary then I suppose it makes more sense, although I would first check to see what they're made from. If it's still just a cast potmetal frame then no amount of reinforcing will help if you install high stress components. If it's a milled aluminum box I would have a lot more faith in sinking large dollars into it.
If all you're looking for is high speed and aren't breaking more than 350 fps or so, I'd say you could save a lot just by installing high speed gears and a few other choice components.
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