Just want to follow up. I finally got a set of excavators(2.35 DTC) and pretty much agree with what everyone here has said so far. The knobs are noticably bigger on the sides, then the knobs on my Nevegal's. Down the middle their ever so slighlty larger, but shaped different then Nev's and bite a little better. After a couple rides now, over very familiar terrain I noticed some pleasant riding differneces. They grab everything and just pull you along. Slow rock garden crawls were a blast. On a couple high speed, rocky downhills, I blasted right through with zero hesitation that they were going to wash out or fail to grab whatever I pointed them at. On hardpack trails they were overkill obvoiusly, but when it got sandy or loose they bit right down and felt great. We have a couple spots filled with beach-like sand that sneaks up on you and where my nev's and others have hit this stuff and kind of throw you off your line, these tires plowed right through as if it was just loose dirt.
On the downside though, they are noticably slower than the Nev's while just cruising along. Not a giant difference, but if your slow like me, and ride with fast people, don't expect an advantage with these tires. I won't be using these tires when the rides will consist of lots of climbing. I got through the climbs with no problems, but I think they'll wear you down over the long haul. At least hear on the east coast. I think once the middle tread wears down some they'll be even better to ride with. The rolling resistance will subside a little and you'll still have the advantage of the big side knob bite.