I have a set - They're fine for stock and mild mod classes, don't know about anything quicker. Reviews on Hobbyking suggest 20c is an optimistic rating, but their capacity is so great that they're still good for 100A draw (assuming ~17.5C rating). The socket in one has sunk rather deeply into the pack.
They are fat, but will fit under the top deck of a B44/BJ4 if you use 90-degree connectors. I also have the Intellect 6000mahs which are of a size, and rotated one pack so that both negative terminals are under the top deck, eliminating any chance of a short. I also use them in my B4 (with longer battery strap screws).
At that price, I'd stretch the extra for a set of Intellects, but those 5700mah saddles are cheaper from HK.
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