Interviewed with 2 senior consultants (30 min each), one behavior and one case. The behavioral component consisted of fairly standard quesitons -- why OW, tell me about a time you had difficulty working within a team, what's your proudest accomplishment, etc. The case tripped me up -- it was a fairly standard expectation problem if I recall correctly, but definitely a different flavor of case from McKinsey, Bain, BCG, & co. I got the impression that they expect their candidates to be up to snuff with their probability, so make sure you brush up beforehand. In general firm culture seemed a bit stiff, but both interviewers were fairly friendly and turn around time was reasonable.