My company did try UltraDNS (now called NeuStar) and our records were deleted twice. Also, the billing is ridiculous, our overages went from an average of $200 to $9,000 and they would provide no logs to support it (says Ray McKenzie "we will be happy to enable our logging feature now and maybe there it will give some clue as to where the queries are coming from").
Their stance, "pay us or we'll turn it over to collections".
Stay away from Neustar (aka UltraDNS)
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My company did try UltraDNS (now called NeuStar) and our records were deleted twice. Also, the billing is ridiculous, our overages went from an average of $200 to $9,000 and they would provide no logs to support it (says Ray McKenzie "we will be happy to enable our logging feature now and maybe there it will give some clue as to where the queries are coming from"). Their stance, "pay us or we'll turn it over to collections". Stay away from Neustar (aka UltraDNS)