Meant to put a comment up here a couple months back but haven't had the chance. Anyway, evaluated a few DNS programs a bit back and came down to this or another product. This won out due to keeping the reverse IPs up-to-date, but was missing some DNS config options that the other product had. An email to the developer resulted in a very fast response (couple of hours if I remember correctly) with an acknowledgement that feature wasn't in the program but was being looked at, and reasonably simple workaround to accomplish what I needed. Now am running my District's DNS servers on 2 Mac Minis running this software. Easy to use and so far very reliable, not to mention impressive reponse from the developer. Kudos.