Just got a pair...
and put them on my Heckler. I live in CO and have three rides on them - Apex, Aldefer/Three Sisters and Kenosha Pass to Georgia Pass. Previous tires were Conti Vertical Pro UST.
Impressions so far:
noticeably heavier & slower rolling than the Vertical Pro's
killer traction on hardpack & loose rock - climbing, cornering & descending
looks, feels & rides more like a very light DH tire than a cross country/trail tire
not a true 2.3, more like 2.2
a little sketchy on roots & when its wet out (could be that they are still new)
did well at Kenosha until it rained - soft forest floor, pine needles, rocks, roots, etc.
burly side wall & harder to get on the rim than the Vertical Pro's
bead sealed without any problem & they do not appear to be leaking air