BK-7m doesn't NEED a fancy controller. You read the manual yet? There's a mode where it only needs to see ONE MIDI channel to get all the Parts, splits, layers, you name it.
And yes, you are wrong (it happens!). It only breaks down into the top section (at 54 lbs) and the legs.
I have friends with the VK8, and others with Electro's (which aren't even as good as the C1) and the difference is night and day. You know how big a Roland fan I am, but when they get it wrong, I am not going to stand by and let it slide! Plus, a VK8 is MUCH better than the G70's VK section. They got a couple of essential things really wrong, like distortion being ONLY after the final volume fader, so no way in hell to get a heavy grind without heavy volume as well, and a pre-Leslie reverb send, so no way to put reverb on the Leslie! Oh, and no way to route it to the separate outs, to run into a real Leslie if you have one (or a Motion Sound, which I do). It might be one of the better drawbar sims in an arranger, but that's not saying a lot, compared to dedicated clones like these!
Plus, a C1 is lighter AND narrower than a T4, even, let alone this monster. And please, just go to the C1 demo page, then the VK8 or Atelier demo page. If the Roland was better (or even close) I would say it, but this doesn't cut it, IMO.
I would take a C1 and a BK-7m over this any day of the week and twice on Sundays..!
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An arranger is just a tool. What matters is what you build with it..!