far as caibration goes - 4 poinmt beats three point forboth sped and precision.

Calibrating the three point system is a real pita. The 4 point system is quick and easier to adjust on the fly.

So for that single operation the x is better than the pro.

Why the manufacturers decide to change from 4 to 3 is beyond me.

I have both. 4 point on a rectangular bed is logical and makes sense.

3 points with 2 at front and one at back, just makes no sense. And it can take a decent length of time before it's dead level.

Weird, bizarre and I wish they hadn't changed it :-)