I did a storm open day here in the UK back in December. We had Pete Somoff from Storm come in, and all I can say is WOW! He was very, very good - he explained symmetric vs. asymmetric cores and who benefit the most from which. He also talked about mental aspect and other parts i never expected to be covered.
I'd have more than happily paid the £20 fee just to listen to him talk about bolwing - that was even before we got onto the lanes! He also took some time to critique our techniques and he noticed that my swing is late so I have been working on this.
We then got to through a load of Storm/Roto Grip balls, I decided on purchasing the Mutant Cell Pearl, it was a toss-up between that and replacing my Rogue with a Prodigy, but felt prodigy would be too much for where I bowl.
I'd recommend these to EVERYONE, and if you haven't attended one you should bug your local Pro Shop
to hold one as I am sure they'd come out ahead! I am glad Jez says they are looking to repeat this, I'll def have my name down for the next one.
A link to the Pro Shop
website with a section on the pro day can be found here: Bowlrite Pro Shop - Storm Open Day