Challenger had a very "at home" feel to it. You could be candid with your bosses, and they seemed to respect your input. Work was not entirely consistent, but it was well presented and the office staff does a good job of providing important information to do your job, and the equipment necessary.
They were very flexible with personal usage of company trucks as well.
My negative experiences with Challenger were based on two factors: The work they have isn't always desirable. It wasn't often we were given jobs that wouldn't wear you down quickly. Expect a lot of long hours and long days.
My second negative experience was in relation to benefits. Before being laid off, I was advised that I was eligible for certain employee benefits, and would be paid out that additional income in addition to the severance they offered me prior to being laid off. When the time came to receive my severance, they advised me that the additional funds I was "previously eligible for" was not paid out because I was no longer an employee, and therefore ineligible for that benefit.
Home feel, good office support, good equipment
Long hours, questionable ethics on HR policies.