I regularly carry 1911's and the EDC X9. I haven't felt under-armed, although I do tend to carry more magazines when I'm carrying a single stack. I've had threats against me on a semi-regular basis, and I don't feel undergunned.
For the EDC X9, I've had really good success with that gun. A decent number of rounds and no issues. I really think they made a great mix of a gun that sorta has 1911 and BHP ergonomics. I think of it like a glock for the 1911 collector who spends too much money on guns as a hobby as well as for protection.