Own two 250ks and threw the x at demo day.  The fit was good so I am responding.

 

The x is really meant for more oil.  Altho, with the x even with the strong cover, it really does got thru the head cleanly.  I was expecting it to check up early as the pattern laid out was house and light at that.  But, at the expense of sounding like a commercial, it is clean thru the heads, very discernable midlane roll and a finish that is more of a forward roll. (I know its just an optical thing, but it does look like it).  Continuation was good, I was expecting a lot of ten pin leaves as I thought the ball would be rolling out.  But it carried better than I thought it would given the oil laid out.

 

The 250k is the big boomer of the two, but a bit skittish on carrydown. (a little surface change would help the individual bowler).  It has more continuation than the X.  very strong recovery even when drill mild. Mine has a 6" pin to pap, but on long light oil, I still need to swing it.

 

 Its more like the x is the Mercedes and the 250 is the Lambo.