DNS/DHCP Network Appliance

Our organization is in the market for dedicated network appliances to handle DHCP and DNS services. We are presently considering Blue Cat’s Adonis, and Infoblox’s DNSOne. So far I have only had the opportunity to talk to salesmen. I’m interested in feedback from anyone who has one of these appliances in production. Hate to base a purchase decision soley on sales literature. Any feedback would be appreciated.