I have both the Leatherman Sidekick and Wingman multi-tools and I think this thing might be better than both of them!
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I admit comparing the Flagship Pro to the Sidekick (and nearly identical Wingman) may not be a totally fair comparison--the Flagship Pro is a considerably larger and heavier tool. With that increase in size, you get a tool that fits your hand a little better and accessory tools that are also a little bigger. I'm not a big multi-tool user, but when you need one they're handy to have around. I'm seldom without one of the smaller Leatherman tools--one is clipped to my bug-out bag/man-purse, and the other is kept handy in a vehicle.
Because of the Flagship Pro's size and weight, I'll probably keep it near my desk at home (rather than carrying it), but I reserve the right to change my mind about that in the future!