Summary
Service from the moment I signed up has been great. Any issues are resolved quickly. Big events (World Cup) are shown in HD quality, along with many other channels also being HD. The channel listing is quite comprehensive with a huge EPG to back it up. For the overall price of $5/mo without VOD, it's amazing.
Channels
Channel availability is really good. Any channel I wanted could be found. There's most all of the popular US and UK, along with sports channels. There are tons of international channels, as well, but I didn't use them. There are, quite frankly, too many channels at first. This was quickly resolved by opening a ticket on their website and requesting categories be removed.
Support
All I have to say about this is WOW. When you sign up, joining the discord is the first move to make. Admins, mods, and users are all friendly and helpful. Any problems you have with the service is met with a quick response and solution. Channel downtime is resolved very quickly via Discord posting. Everything from service options to account setup was personally handled via PM by a TNT admin that couldn't have been more helpful.
Issues
In the course of using the service, I have only had two problems. The massive channel list causes extreme load times within my Emby server, but the load times were shortened via opening a ticket and removing channels. And, their app when used with remote will constantly backtrack a day with certain channels that have 24 hour programming. This isn't such a huge issue as much as it is an annoyance with all the scrolling.
Overall, this has been a really great experience with minimal issues. For the cost of service and support received with it, they are unbeatable for $5.
First signed up with TNT on April 16th and this review is spot on IMHO.
Might also mention that they have a good Kodi addon and also a TV Guide EPG addon for Kodi. We seldom use Kodi now but the addons are a very good option for those who do use it.