The longer answer: The Double Agent is fine if you're a lighter rider that doesn't need the extra flotation to get up and going or during lulls. However, if you're heavier and trying to get up and going in lighter winds (or slightly underpowered on a small kite, which is going to happen a lot as a foiler), then I think you benefit from the extra buoyancy of the X-Breed Foil board. AND, with the XBreed, you have a legit surfboard to use by just removing the mast from the board. I think the Double Agent minus the foil is certainly secondary in performance to the X Breed. I believe that enough that I bought the X Breed Foil for my own personal use.