We are currently using T-Mobile for our internet needs, as we are both gamers and love binge-watching shows. There are benefits and drawbacks though.
First is the issue of supplying internet to other devices. We have 4 lines, each with unlimited data (LTE, no throttle) and 14gigs of Hotspot use. This allows us to supply 4x14=52gigs of hotspot to our devices throughout the month, or just under 2gigs per day.
We never get close to that though, due to some of the other benefits the plan has.
Binge-On - T-Mobile does not count Pandora, YouTube, Hulu, Netflix, and dozens more streaming sites against your data usage (phone will show full usage, but bill will show reduced amount). This includes content access via Hotspot, so we can use our Chromecast all day and not use any of our Hotspot allotment.
Vudu Codes and Sling Discount - Each month, each line gets 3.99 in credit towards Voodoo, which can be redeemed to one Vudu account and used for larger purchases (such as newer movies or digital downloads). There is also a SlingTV promotional rate that we may use at some point.
We generally stay in decent metro areas, stationed near Walmarts. The few times we have ventured out to RV Parks, we had no signal strength. To counter that, we have picked up a signal booster, but currently it only works for a short while before heating up and only for the device seated in the cradle.
I will say for those who are on an unlimited plan but no tethering is available, we have found two options:
If you have an Android, and are comfortable flashing a custom rom, you can install a version of Android with Hotspot unlocked, or make use of Connectify(a desktop application that connects to a phone) to create a personal hotspot that routes all traffic through your phone so that it appears as phone usage. (caveat, do try to keep traffic within reason for the device, ie, no UHD or higher resolution. Stick to 1080p and below and you shouldn't trigger alerts on your provider.
If you have an iPhone and don't mind peripheral devices, there is an adapter(we got ours at Best Buy for around $30) that allows your iPhone to be displayed on a larger screen (we use it to watch Netflix/Hulu in the back, as our Chromecast is on the bigger TV up front). There are dozens of external keyboards that can work with an iPhone, so with the right apps you could go sans normal computer and get everything you need done.