I know Dyn offers many different services, but I use the original product, the updater, and have for the last 10 or so years. I have my DNS hosted with them for my setup at home. The speed of updating the host record is excellent. I essentially never have to force it to update, and I haven't had any unavailability after an IP change yet.
The cost has gone up a bit over the years, but it's still worth it in my opinion. There really isn't much to the product that I use. It just works.
I use this for access to my server and workstation at home, where I can't get a static IP from my ISP.