Cam, I'm running the Butcher Control 2.3 up front, and Purgatory Control 2.3 on the rear. Tubeless. I'm loving this combo on the Enduro.
It's worth noting that the Purgatory got updated fairly recently; the 2.3 is essentially the new version and the 2.2 is the old version. At least, that's my understanding. The new one got the same "FE Analysis" tweaks that the Ground Control got last year. The side blocks are a bit beefier, and they seem to cut in better when you lay it over. Obviously the tread pattern overall is very similar compared to previous years so it's not like it's a totally different tire, but as someone who's been running Purgatory 2.2's for a while it seems like Specialized "did a Ground Control" with this new 2.3 and somehow they both roll faster and grip better with that slight tread adjustment.
The Butcher I hadn't ridden before (I've more or less been DHF/Purgatory in winter, Purgatory/GC in summer on the Stumpy) but as someone mentioned previously it's shocking how well it rolls considering it's burl. I was planning on switching to a Purgatory up front, but the Butcher is confidence inspiring on the Enduro. It's got that "low rebound rubber" feel to when you hit something harsh that the Purgatory just doesn't have. It doesn't bounce/deflect easily. I decided I don't care about the extra 45g, I'm keeping it on there. :)