Re: john petrucci musicman vs and ibanez???
I love my JP6 with Piezo - sounds, looks, and plays great (as I'm sure you know, the EBMM necks are to die for - considered by many to be the perfect neck). Build quality is top notch as are the materials utilized. The trem is one of the best available - floats like a floyd, has a great feel, and the piezo elements are absolutely amazing.
I'm hoping to mod it soon installing a push/pull in the tone to allow splitting of the pups. I believe that would make the guitar much more versatile (6 pup options instead of only 3) and thus I think I'd play the guitar much more.
High end Ibanezs are comparable though. In the end, it depends on the features (piezo, locking trem, etc.) you're after along with the style that you like more.