I'm just surprised at this ball. My very first game I used it, I shot 289 (7-pin in the 11th)... and have since shot some more big games when nothing else is working.
I've got another post that is similar to this one already in the Roto Grip forum, but I'll say it again... if the RS-1 is a little too strong on the backend, then you can go right to the Ultra Sonic and get the same ball reaction shape, but just slightly less overall hook. A perfect step down in an arsenal!
I hope Roto Grip has no plans anytime soon to discontinue the Ultra Sonic. Which I think I will probably buy a couple more to stash away (like I do with most great balls that I match up with) for when this one wears out.