I use their free option for an OwnCloud server. Been running it for a couple of years through various upgrades, router changes and reconfigures, and a couple of internet losses. No-ip has always been absolutely fine. I can access my server (which is also a Raspberry Pi) connected wirelessly to the router from anywhere without problems. I connected from a cafe's wifi in Venice at the weekend and dumped some photos from my phone without a hitch.
They don't hassle you apart from the monthly email to confirm that you want to keep the account which is just a couple of clicks. Oh, every couple of months they send out some advertising for their other services but it's pretty low key and there's never any pressure.
EDITED: 28 Jun 2018 19:29 by WILLIAMA