I have a
EBMM Petrucci 6. The neck is very thin & nothing like the Silhouette or Wolfgang. Its thinner & wider with a flatter
fret board. The closest neck I have played to it is the Ibanez Wizard on the RG 570 & 1570. It has a more rounded asymetrical C type carve though.
If you like the Wizard neck you will definately like this one as it is smoother feeling & the flat fretboard allows you to set the action ridiculously low without buzzing. It is an unsealed neck meaning that you need to oil & wax it once a year.
In my opinion you don't need big hands to play this but you have to like thin necks.