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I could not put it in the article, but for my personal projects I use worldwidedns.net and mtgsy.com. I've also used DNSPark.net but their admin interface is nasty.

Well I can't speak for all domain registrar DNS services, but I've had nothing but great experiences with the free DNS service at Namecheap. It's a nice interface, very configurable, and the updates are fast.

There can definitely be benefits to the very important first visit to a site, particularly if you have a lot of subdomains (images, static, movies, whatever) that need to be resolved. The faster they resolve the faster the site will seem. Unfortunately I can't make any recommendations.

When I looked into this a few years ago dyndns.com was a good affordable service.

dnsmadeeasy.com

ultradns.com - fast, reliable, scalable

Absurdly expensive.