I got them for the purpose of reviewing them for jemsite.com
First of all--THANK YOU STEVE! I'm not sure what you had in mind when you sat down with Larry on these, but WOW!
I love the beefed up mids on the bridge model and the near flat EQ on the neck model. These are so thick, rich and organic that my review recordings sounded like I had actually double-tracked my guitar. I only double-tracked it for my song Circles, as there are two different guitar parts. The straight review recordings sound very thick. These are by far my favorite DiMarzio pickups ever! I've got about every model DiMarzio ever released and different combos in my 36 various Ibanez guitars--these babies scream!
For the review, I installed the DiMarzio Gravity Storm set in my Ibanez RG620x. First, I ran the guitar dry through my Dime Blacktooth 20 watt combo--just so fellow guitarists could hear how great these make even a small practice amp sound. After that--I ran the guitar straight and dry into my multitrack deck.
For the song Circles--I used a bit of processing and double tracked the rhythm parts.
By the time I got everything ready to go for the review--it was 2 am, so cranking a tube amp was out of the question.
I'll be running these through a cranked tube head next and will post the links to those clips.
Please do not use my picture or recordings without my permission! Unfortunately for a gentleman in Japan--I had his blog page shut down by Google for stealing my pic from Jemsite and not giving credit as to where he got it. If any of you have a blog and would like to use my pictures while letting your followers and readers know there is a new Steve Vai pickup set on the way--please ask me first. These are neither posted on the DiMarzio page yet, not Steve's site. I'm not sure when they will be available to the public--I'll ask Larry this week.
While the reviews are waiting to be published, and I'll post the link when they're live--here are a few teasers:

http://soundclick.com/share.cfm?id=11766008" onclick="window.open(this.href);return false;
http://soundclick.com/share.cfm?id=11766009" onclick="window.open(this.href);return false;
http://soundclick.com/share.cfm?id=11765974" onclick="window.open(this.href);return false;
http://youtu.be/BSmZTxPIlGM" onclick="window.open(this.href);return false;
ENJOY!