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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 Offline settings
Option to redirect to a URL or display offline message.
Pro Supports custom domains
Allows using own domain names.
Pro Free client software for different operating systems
Free IP Update client software for Windows, Mac OS X and Linux is available.
Pro Extremely fast IP updates due to user controlled TTL
Con Some features are only available if you get a paid membership
You don't get all of Dynu's features with the free version, some of them (offline settings for example) are only available if you get a paid membership which costs $9.99.