I just bought the double cone 250 with a speedy 3. From what I could scratch up from the interweb the cone shape is an evolution in skimmer body shape. It's supposed to allow the bubbles a smoother path to the skimmate cup. Thus preventing them from popping prematurely. Skimmer King is correct when he says get the appropriate model. Other brands you can get something made for a 200-300g tank and run it on a 75g. The BK's are pretty needy and are sized accordingly. Get something too big and you won't get good skimmate production in the neck.
Just my .02
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