Do we have any type of statistics on how often these walk away splits work?.....if you have either Queen Cells and/or Fresh eggs....what percentage works and what are the percentage that this fails?
Well, I can tell you from my experience last summer, out of 3 hives I ended up with 11. Some were swarm cells, a couple were virgin queens I happened to notice, some were walk-away splits I intentionally created from eggs/larvae. I've heard people talk about failure rates, queens not coming back, etc., but 100% of mine requeened successfully.
The one time I tried a home-brewed version of a walk-away split it turned into a disaster, though I did, eventually, wind up with with a new queen, while keeping my old one, as well, in a different colony. But, as usual, my bees paid a steep price for my lack of experience. It was probably cluelessness more than anything else, but the drama of it put me completely off that method. Now I use Snelgrove boards which I like much better.
If you're asking about getting a cell drawn and a virgin queen mated and safely back and laying: Last summer I started twelve splits and with thirteen total tries (one took two attempts) I got twelve swarm- or emergency- cell queens cooked up, mated and established in their own colonies, and even more importantly, all survived the winter, even though I gave away half of them last summer.
It's quite astounding that bees can do this sort of thing so well. I feel like I'm just a bit player - the bees have got this all figured out. I just need to stay (mostly) out of the way once I set the stage.