I said I wasn't going to do this, but after what I heard at RMAF and Ivan making it so easy, I buckled. I bought a G-02x.
I believe they showed a G-01x at RMAF, but I could clearly hear the difference when running it into a K-01x vs. using the stock clock. The K-01x has a clock accurate to .5ppm (same as K1, BTW) and the G-02x is accurate to .01ppm. That's quite a bit of improvement. G-01x is actually much more accurate, but I am hoping that I can still hear the improvement from the G-02x.
Thanks Ivan!