I ordered a dozen MTB-X as I'm doing ball testing for myself with ProV1/X, Z-Stars, TP5/X, Mizuno RB/X, and now these. These were very comparable to the ProV1 X but the yellow coloring is weird. It's not a chartreuse color like you get with the rest of the balls out there. It's a flat yellow like some of the Volviks are. If I decide to play white balls this year they'll be in the mix, but the yellows are out for me as they just look strange.