Danaher interview questions

Initially contacted by a head hunter who did the initial interview. a couple of weeks later I did a phone screen with an HR person who did a very extensive hour+ interview over the phone. The process was 100% focused on what she was looking for and 0% focused on what I wanted to know as a candidate. Two months passed with no word from the company and the head hunter called me on a Thursday evening and asked if I could interview all day that Saturday. The logistics where fine. I met with about 5 people and the experience was like one long interrogation. Sharp pointed questions followed by a ridiculous level of detailed follow up questions (as if trying to "catch me" on some inconsistency). Another month passed with no feedback. Then I get a call from the headhunter who said that they want me to meet their industrial psychologist for several hours at an airport conference room. I met with the guy and he was all business. Ran me through a bunch of gmat-like questions, psychological tests, an in-depth interview. Another month then I was asked to come back and interview with some of the same people asking the same questions. I ended up going back a total of 4 times before they started talking about offer. Not a lot of "selling" through out the process.