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Had a Borla system on my 97 Corvette. You can't beat the quality of their products. Can't help you in ref to a Super Duty but I'll bet they sound nice and improve the hp and tq.
That is what I am hoping. I'm not necessarily after a louder truck and do not want drone in the cab so that is why I am looking at a Borla. Most reviews I have read have been on par with what you stated regarding the quality.
There's always the free option. This guy (and many others) had a muffler shop remove the stock muffler (the last thing in exhaust chain, just before the rear axle) and weld in a piece of straight pipe. This person states both resonators are still in place (which will prevent excessive drone at highway speeds or when towing in the cab) I think it sounds pretty good, especially considering what he paid (probably $75 at a muffler shop for the work).