Volume wise there is no problem with the X1 driving the Laylas in either SE or balanced. However in my opinion, the quality of sound is good, but it also cripples why you pay the ridiculous price of the Laylas. The sound is dark and veiled with less soundstage on the X1 compared to amps and DACs I've tried with Schiit Gungnir 2, Cavalli Liquid Carbon, Vorzuge PII+, ALO CDM, and Chord Mojo. You don't know what you're missing with the Laylas until you try it with some higher end gear. In fact, I think Rosies pair better than the Laylas on X1 and it cost only 1/3rd the price. With the right setup with the Laylas, it rivals the best closed headphones. I sold my Ether C because I didn't feel a need for it after Laylas. I may sound like I'm just scaling performance to cost, but I would never use Laylas with any of the AK DAPs I tested from AK240 through AK380 either for the same reasons I state for the X1.
Now, if you are willing to accept that you are getting a crippled sound out Laylas (which still sound good) and just want the convenience of an all in one DAP for portability, sure go for it. But if that's your end game setup, you are wasting a lot of potential on the Laylas that the X1 will never be able to deliver on it's own.