i saw the guy who drills my stuff using the pyro last night. the ball went long, long long, and then a left turn hard enough to warrant installing a directional on the ball. he usually drills he stuff with pin split over the fingers and cg in line but he did somthing a touch more aggressive and left the ball in its OOB finish. very impressive.

Vertigo
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Storm, Etonic, Vise. The best arsenal, PERIOD!!!!

I have both it really depends on the reation you are looking for on that condition.  They are both med heavy balls and both in thier out of box condition they can handle good amout of oil where the pyro will skid farther it definately makes up in the back end.  And this pyro has the strongest backend move i have ever seen this year it is sick.  It is my favorite ball right now when there is enough oil to throw it.  The diablo can cover but it has a much earlier move than the pyro due to its surface.  It is much more of a hard arc as apposed to a hard skid flip from the pyro.  But they are both great balls for heavier volumes of oil.
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Boy do I love bowling, stone 8,stone 9, ringer 7,fly by 10,fast six got to love this game.  Short look at what most of my games look like with a few strikes peppered in between.  Isn't it wonderful.