There's no reason to use anyone else (10+ year customer here.)
I don't know why I haven't reviewed these guys here before now, because encouraging and supporting great small businesses is something we should all do more of.
We've used USA Printing for 10+ years and they are our go-to choice for pretty much all 4 color printing. We've also used most of the large volume printers (and several other small local shops) so have a pretty good basis on which to judge.
We've had USA produce everything from catalogs to DVD inserts to flyers to brochures. Their printing is always high quality, and turnaround is generally very quick.
We're pretty price sensitive, and USA is always competitive and sometimes the least expensive off the bat. When I've found lower prices at competitors, they have, in almost all cases, matched it. (Do make sure your price match includes shipping, as we've been dinged on that a couple of times. But hey, people need to make a profit.)
Quality is excellent. I can think of two occasions over 10+ years and probably 100+ jobs where something missed the mark, and they were quick to make it right.
Turnaround is generally quick, and if you need something super fast, they can generally help you out.
And they're a lot easier to work with in terms of preparation of artwork and what they can work with compared with the other large competitors where everything is automated.
Oh, and you're dealing with real people here that you can get in touch with, which is becoming a rarity these days. They answer the phone and actually respond pretty quickly to emails... something you *definitely* won't find with the bigger guys.
You know the old joke of "price-quality-speed, pick any two?" Well, with USA, you generally get all three, which in our experience is pretty uncommon.
So I'm always happy to recommend and support a small business that does great work. Couldn't recommend them more highly.