Personalized Name Servers are generally used by webmasters who will be reselling web hosting accounts, and want to add a professional look to their DNS.  

Why?  If you're reselling accounts under your own entity, you could use our name servers, which would be sent to your customers in the form of:

DNS1.CYBERHOSTPLUS.BIZ
DNS2.CYBERHOSTPLUS.BIZ

Not bad, but what if you want your DNS settings to appear as a part of your company? 

Let's say your company was

www.myveryownwebhostingshop.com. 

If you desire, you could setup your own custom branded DNS, which could display as:

ns1.myveryownwebhostingshop.com
ns2.myveryownwebhostingshop.com

This provides a somewhat more professional look to your customers when sending out your DNS settings in a welcoming email. 

In addition, if someone does a WHOIS lookup on your domain name, it appears as your personal DNS, as opposed to the company you're reselling for. 

Not really a big deal, but some webmasters do not want to advertise the host they're reselling for, as they feel it does not portray a professional and independent look.

Personal name servers are offered to clients whom are a part of our (reseller program). 

If you're not a reseller, please use the standard DNS settings we provided you.

 There is no superior advantage to having your own name server unless you're a reseller, and or a web designer who is also planning on hosting the websites they build.