We offer you 5 nameservers at 4 fysically independent locations (Belgium, the Netherlands, the United Kingdom and the United States). That way, we can guarantee you the best possible uptime if you use our nameservers. Even if one or more nameservers would go down, the others will take over its tasks. Your customers won't notice this at all.
Moreover we also offer you some nice extra's such as our default white labeled nameservers. That way your customers won't get in touch with us. If this isn't sufficient for you, we also offer you the possibility to use our nameservers but give them your own name, free of charge. Like that your customers won't notice you're working with a third party because in the Whois-information nameservers with your own name will be shown.