Not a hell of a lot to add to what Toshiro said here, but I just thought I'd chime in with my two cents here - I've had a Hellraiser for a month or so now, and liked it enough to grab a Blackjack over the weekend.
Initial thoughts are that I'm actually digging the Blackjack more - the EMG's totally shocked me with their lead tones (there's a clip floating around me doing a convincing-enough David Gilmour on the thing), but I couldn't quite get the sort of low-ish gain growly/crunchy rhythm tones I like out of them. They're just a little too focused, EQ-wise, and "tight" for a big, growly rumbly rhythm tone without some SERIOUS gain (at which point they sound tight, defined, and brutal) in play, and I don't like that much gain. Also, while I initially figured I'd just swap it for a Jazz based on other players' recommendations (who I trust rather a lot, I should note), I'm absolutely digging the '59 neck. It's gorgeous clean, and at the moderately saturated levels I play at is just this gorgeous neck pickup lead tone. It's a bit muddy for rhythm, but only communists and terrorists play rhythm on the neck pickup anyway.
The upper access is weird - Toshiro's right, the Hellraiser's neck joins the body one fret higher than the Blackjack. It's not a huige deal for me as I'm more of a middle-of-the-neck soloist, but it's strange considering how similar the two bodies are.
The controls on the Blackjack are probably a little more "familiar" for an Ibanez guy - you've got a master volume and master tone, and a 5-way wired up more-or-less the same as Ibanez's Special-5 wiring. The Hellraiser, meanwhile, has a neck pickup master volume, a neck-and-bridge and bridge pickup master volume, and a master tone. This is pretty cool for Morello-like killswitch stuff, but is something you have to keep in mind if like me you like to ride your volume knob a bit while soloing. Of course, as the neck 707 kicks all kinds of arse for lead playing, I don't even see the point of switching to the bridge unless the gain's way up anyway.
The other surprise is it could be my imagination, but I think the Blackjack's neck might be sliughtly slimmer than the Hellraisers. This isn't as far fetched as it might seem at a glance in that the Blackjack is maple while the Hellraiser is mahogany and maple strikes me as the slightly stiffer wood. Either way, if you're used to a C1 then you should have no trouble moving to a C7.
I don't know if I'm going to keep both - they're both awesome guitars, but while the Hellraiser (in black cherry) is a total showstopper in the looks department, there's something attractive about the understated Blackjack vibe, and tonally it's more "me," I think. We'll see - I'll give it a month or two.