I shoot an X5 in Carry Optic Steel Challenge.
If you are going to shoot both Steel Challenge and USPSA (I am planning to do USPSA next year) the big difference to remember is that Steel Challenge has no minimum power factor and USPSA requires a minimum PF of 125 for Carry Optic. I like my 147 grain coated bullet at about 860 fps to accomplish the 125 PF.
I purchased my gun from a buddy and he had already installed the Grey's straight trigger, it is excellent. I have also fired this gun before he did any work to it and it has the best trigger of all the striker fired guns I have shot over the years from the factory.
Springer Precision makes a lot of really good upgrades for the X5. I put on the red (most aggressive) grip tape, adapter plate for the Sig Romeo Max (6 moa dot), recoil spring rod (needed a lighter spring). I plan to put their magazine base pad on with grams followers before next summer.
I think you will grow to love this gun, I have