We went down the Falcon road recently. We got a new campervan a year ago, and decided not to fit a tv antenna or a satellite dome. We had both items on previous vans, and decided that the satellite dome in particular, was a waste of money.
We were due upgrades on our phones so after a bit of research went to EE and got a deal from them. In addition to the phones, we got an unlimited SIM for the Falcon. Now this next bit may not be exactly accurate, as my wife dealt with the whole contract thing, but as far as I know, the Falcon SIM is on a monthly contract. Connecting our tablet, we are able to cast the picture onto the tv through Google Chromecast and watch BBC Iplayer, Disney and Netflix by logging into our account. ITV is a bit difficult, and we haven't quite worked out how to do that.
The real bonus is logging into IPlayer for the weather forecast when in UK. We live in Scotland and do most of our trips here, especially up northwest and so far its working well. I think we've only had one site where we couldn't get a signal to connect onto.
We toured Europe earlier this year and used the Falcon there. You have to log into your EE account and enable roaming, and pay slightly more. We had a few probs doing this the first time, which involved calls to Falcon, but they were helpful and sorted it out. Important to remember to notify them when we returned to the UK.
So far, it is working well and we've enjoyed using it all through the UK. We just stick it on the outside of the window where it always seems to get a signal. You can connect several devices, I think four or five, meaning the phones always get a 4g signal. We even use it in preference to using free WIFI on sites, it works so much better.