It's a good company, their office is 1/4 mi from my office and a friend of mine works there. They have decent rates and tend to know what they're doing.
I came here to ask this exact question. Using the Credit Karma "find me a better rate" feature, New American Funding is the lowest rate, taking into account my credit profile and based on their rate, I would see a pretty decent savings on my monthly mortgage payment (it's a fairly new mortgage, so the savings is based on the interest rate, not th eloan amount).
Glad to see at least one positive nod.
OP - Did you use them??