Last year (2012) I spent 5 months tooting around the country with 3 dogs in my car, interviewing trucking companies. (There's a longer story behind this but that's enough for this thread.)
I seriously considered Arnold because like parent US Xpress, they are dog-friendly, and I visited them in Jacksonville, FL. What impressed me was talking to drivers right there on the sidewalk in front of the terminal. One fellow in particular, who had about a year in. He said that he and a couple others in his CDL class started with Arnold and within six months most of his class came over as well. They had initially gone with all the names you've heard, including Swift. Oh, yeah, I did speak to a recruiter, too.
The young driver and I talked for about a half hour, about trucking in general, about Arnold, about US Xpress. He had nothing to gain by BSing me. His CDL class pretty much came over to Arnold... eventually.