As a follow up:
I'm looking forward to the Advantage 2, and based on what I've heard I'm guessing I'll be getting one or more.
I'm also going to split it...but this time I'll do it differently. I may enlist the help of Kinesis, Input Club, other GH members and whomever else needed to make the split clean, professional, not an endless project, and possibly upgrade from even what improvements Kinesis is making. The split will be caseless, which is the final mod I was going to do on mine. I'm not investing any more time/effort into my mod since the new model is being released.
The big items will be splitting into 2 halves, integrated pointing device (I hope to find better than the TrackPoint I now use, PBT keycaps (I hope someone has been working on this), and caseless.