I bought these for my six string solely for the fact I'm a petrucci fan and liked his tone - upon buying, even though I've wired pickups in the past with no issues, for some reason even after following the simple instructions properly, I had major issues as if they were merged. I took it to a professional who managed to get it working although at this point I'd spent nearly as much as the pickups cost on getting them fitted properly.
Then once fitted, I thought the tone was awesome! But, the neck pickup didn't have the thick tone I was originally after and seemed to lack the clarity I was hoping for originally.
On the whole, I won't say these pickups are bad, but I do believe the other dimarzio models are better, but I also found that ENG pickups have me exactly what I wanted for tone, and I'm a solo artist who plays many genres from country and blues to advantaged metal such as Meshuggah.
Pros - great string separation, nice crunch tone on the bridge, makes playing easier, great clean sound
Cons - nightmare when installing, thin neck tone, only a slight difference from my Ibanez stock pickups