I own a Parker Nitefly (the USA bolt on, not the import P series). It isn't a set neck like the more expensive Parkers, but it does share some of the same characteristics such as the stainless steel frets, carbon/glass composite fretboard, and Parker designed bridge.
I find the ss frets make bending easier. I've heard complaints that the ss frets decrease string life, but I haven't noticed a big difference. The Parker designed trem is very stable, it works better than most trem bridges I've tried. All the USA Parkers that I've played or seen have been very nice, none seemed low quality (I have not tried any of the P series).
I've never owned a set neck Parker, but I have tried them. They are lighter than the Nitefly and feel very different. Though the outline is the same, the set neck bodies have much more extreme cutaways. Most other guitars (including the Nitefly) feel like slabs in comparison. They do feel very strange, this is probably why many players feel that they lack the "vibe" they are used to from other guitars. A set neck Parker would take some getting used to.