I quoted both NSF and Entella, and ultimately chose NSF, and I am very happy with the decision. I found the audit team they provided to be very experienced and through, yet real world in their approach. I think that we got a good audit, and that they provided value for their fee. (Yes, we have been recommended for registration!)
I eliminated Entela early in the process, because they were the only ones to quote more days (2 1/2 extra) than the standard required; they were willing to reduce it to the required days when asked, but they did indicate that the initial quote was not an error. Frankly, I felt that if they thought 10 1/2 days were required, they should have stuck to it. They also quoted me an extra 1/2 day for each surveilance audit, which was not common with anyone else I quoted. As I was early in the process of quoting registrars, I eliminated them. I quoted quite a number of registrars, and then tried to disqualify the lowest bidders; NSF was competively priced.
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Tom Goetzinger