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Pro Advanced DNS records supported
Various DNS records can be setup for your domain name including A, AAAA, MX, SPF, SRV, DKIM, TXT, PTR, HINFO records etc.
Pro Includes url/port forwarding
Their service includes a system for redirecting URLs (including to a different port).
Pro Thorough setup instructions on different routers and operating systems
Dynu provides thorough setup instructions on different routers and operating systems. Everything is explained in a detailed and understandable way even for beginners.
Pro Free client software for different operating systems
Free IP Update client software for Windows, Mac OS X and Linux is available.
Pro Supports custom domains
Allows using own domain names.
Pro Offline settings
Option to redirect to a URL or display offline message.
Pro Extremely fast IP updates due to user controlled TTL
Pro Custom nameserver records for sub-domain names
If your domain name uses their nameservers, you can set up other nameserver records for your sub-domain names if you want to use those sub-domain names with other hosting providers. This kind of flexibility does not exist anywhere else.
Pro Custom DNS records for your own domain name
Dynu allows you to manage DNS records for your domain name for free. Supported DNS records include A, AAAA, MX, SRV, TXT, SPF, NS, HINFO, CNAME etc.
Con Some features are only available if you get a paid membership
You do get to use all features of Dynu services with a free account. But if you need to use say 300 hostnames, you may need to pay $9.99/year membership fee. Usually, a free account is more than enough.