Amazing sounding pickup!
I did my research before choosing a pickup. I play an Ibanez Prestige RG2570 with a Basswood body and a Rosewood neck that came with the original Dimarzio/IBZ pickups. My amp is a solid state Gallien Krueger 2100SEL 100x2 stereo amp. If you are an Iron Maiden fan than listen to 'Somewhere in Time" and that is the exact sound I have. I also run a Yamaha Magic Stomp pedal for delay and then into a MXR 10 band EQ with a volume and gain level in the effects loop of the amp. I like to push the mids in my sound and the stock pickups lacked tightness, clarity and dynamics.
For me Ibanez and Dimarzio have always been the best combination for metal and fast playing/shredding. So I used the Dimarzio website to use their pickup selector. For every selection they have, the Gravity Storm came up 90% of the time. I am a big Steve Vai fan also and I love his lead tone. I bought the pickups, neck and bridge and installed them. I have direct mounted style factory pickups. Even with telling my salesman this, no options were available for direct mount or standard machine screw/spring set up. You HAVE TO drill the pickup mounting holes because Ibanez uses a shouldered screw that is larger than the threaded hole for the machine screw. If you don't realize this you will strip out the wood and have to fix it.
Tone wise, the pickup was a night and day difference from stock. The mids are fatter, the dynamics are present and brighter, the clarity is amazing and tight and the volume is just slightly hotter. Everything I wanted in a distortion channel pickup is here and more. From playing chords to leads, the pickup responds with zero weak spots. The chords are not over distorted, they sound and sing naturally. The leads are smooth and transparent, not thin or nasally. This is a pickup with more mids to it but that was what I was looking for. The sound is more prevalent because of this and to me that makes a better sounding pickup.
The only drawback of the pickup is the clean channel on the bridge pickup is slightly too bright. But I can work with that. I didn't buy this primarily for clean playing. This pickup delivered for distorted playing everything I was hoping and looking for. It leaves virtually nothing for me to look for in trying another pickup. I haven't had to change any of my amps settings, only adjust the eq pedal, which I have done slightly with the mids and lows. If anything I have upped them and the pickup is only sounding better.
Also, the F spaced pickup is the only way to go in both the neck and bridge on my model Ibanez Prestige.