I've been going through OMA on Thursday or Fridays every week since July. I've seen WBI in operation maybe 4 times out of all those trips, all other times it's been roped off. The first time I saw it operational they were sending 1 person through WBI for each 6 or 7 people that went thru the WTMD. I got selected, it went poorly, long story chronicled in the beginning of the opt-out experiences thread. That particular time I dealt with a TSO that was a surprise-ball-grabber and rough.

However, the visits since have been pretty much uneventful. I was selected again a month later when WBI was in operation and got as much of a "professional" patdown as would be expected; TSO was courteous and communicative and didn't touch my junk. They'd always been polite before WBI as well, so I think they're mostly okay.

Edit: I happen to know that some of the TSOs there (at least one 3-stripe sup) are former prison guards. That may explain the occasional cold demeanor; some of them may be used to treating people without any rights.