I've an 07 Kona Unit, lovely deddacci(sp?) steel frame. Built up rigid and singlespeed and I love it. Keep thinking of changing it but can't think what else I'd need it to do.
Even though gazz mentioned the perched feeling, remember that the BB height is the same, you are no higher or lower than a 26er. If anything the overall feeling is off being in the bike rather than on top of.
Cheers rides better than it looks too! Agree with the brifters, they may find themselves swapped to the other Kona. They'll still be fugly but at least they'll shift gears.
Gazz the Ardents are mega. Very grippy but I find slightly on/off you need to commit to the turn. I reckon I'd try something less gnarly on the back one day.