As already stated, the

skitters around like a dog on ice without the centerboard and at least one rudder down. I even put it on the trailer with the CB halfway down, pulling it up right before it hits the rear bunk, though it would just swing up even if it did hit. The rudders I leave uncleated for such slow speed maneuvers if there's a risk of hitting something. They'll stay down just fine at idle speeds. Won't kick up in reverse, though, and the centerboard will dig in rather than kick up in reverse, too, so you have to be aware of the bottom.
With the rudder(s) down as well as the CB, and the engine linked to the rudders, it's a strange technique that's required for docking. With a keelboat, if you want to swing the stern close to a dock that's on the starboard side while you're moving forward, you just spin the wheel to port while moving forward and run the engine up in reverse to slow down at the same time. The stern will continue to move to starboard while the boat slows and stops. With the X, if you do that, the engine will pull you to port when in reverse, and overpower the rudder(s). Took me a while to get used to this. Come in with the engine in neutral or at idle, and it handles more or less like a keelboat. Run the engine up in reverse, and it behaves like a powerboat, so you have to spin the wheel to starboard and hit reverse, which will overpower the rudder(s) and pull the stern towards the dock on the starboard side.
It's not hard when you get used to it, but I have to turn around and eyeball the OB to remind myself which way it's pointed before giving it power at slow speeds so I don't kick it (forward or reverse) the wrong way.
I've tried it with no rudders, but I don't like it. I use one rudder for docking virtually always, as well as the CB down about half way or so.