The horrendous application is just the start. If there's ever been any credit hiccups, expect to be probed in a southern orifice by a bent microscope by the freelance proctologists that call themselves the government. I had some in my application, however, have paid everything off that was previously on my credit report. I am only legally obligated on one debt, and I reported that, otherwise they never would have known. The interview with the, um, person from the Federal Investigative Service started the ball rolling downhill, when he showed the results of my investigation, and on the top was a SS number that wasn't even close to mine. Still, to this day, I am still trying to explain my delinquent accounts with Georgia Power, several medical providers in Georgia, and the $74 collection account from the "Black Essence Book Club". Want a laugh? I've never lived in Georgia, and I'm white.
My initial application was filed over a year and a half ago. My last written correspondence with them was my assertion of my right to a hearing in front of an administrative law judge. I made clear to them that I do fairly well without it, but I'm so far invested with my time, that it's now a matter of principle. The Fed also slightly dropped the ball in this, which accounted for a good chunk of the time.
Now that I've done all this typing without answering your question, I'll tell you that several of our peers do well with it. I don't believe it's huge money better, but like having more qualifications, can be a tool to get you moving where you otherwise wouldn't. It also (sometimes) means being predispatched, where you can schedule your sleep and driving shifts a little better than a regular surface truck can. The latter is what is attractive to us.
Hope that helps.