I have an X1. Works fine if you do, indeed, recognize it's limitations. First off, it's small. So, it isn't gonna do for large parts. It's not that powerful, so small cuts and slower feedrates are required. Would I like a larger one? Sure. but getting a large one down into the basement would be problematic, and the price on this one was very good. I got mine for less than $300 with a screwless vice, rotary table, clamp set and a couple of mill holders. For that price it's a bargain.
One major advantage (at least to me), is that the spindle is MT2, which is the same as the tailstock on the mini lathe. One set of mill holders for both machines, one set of drill chucks, etc.
One major drawback is that the head lock raises the spindle by a couple of thou, and drops it by that much when you let it off. Letting off the lock in the middle of a pass could cause the mill to dig into the workpiece. If you realize this, it's easy to avoid.