I have a Starband System. It is slower than DSL, and the service is $80/month. That being said, it is reliable - you just need a clear view of the southern sky.
Of the three main satellite internet providers (Starband, Hughes, WildBlue), only Starband truly supports mobile users. Wildblue, and the new Hughes Gen4 are 'spot-beam' systems. Once your service is set up, at a particular location, it requires a certified installer to move the system to another location.
With Starband, you do need to be 'certified', by them, in order to move your own system. It really isn't difficult to become certified - they have on-line training, and they you have to pass a test based on the training.
After you have moved the system, a few times, and have gotten familiar with the setup procedures, you should be able to get 'on the air' in about 45 minutes. So, it's really not for over-night stays, but if you are going to be some place for a few weeks/months, it's good for that.
The equipment isn't cheap - expect to pay $1500-2000 based on options (tripod, satellite meter, &c.). I got the system in 2007 because camp-ground Wi-Fi was so unreliable, and this is still quite true today.
I do some web-site work, for clients, so I absolutely need to have a reliable connection. Internet service, via cell-phone, wouldn't be a good solution for me because of the monthly band-width limitations. Starband also has band-width limitations, but not as limited as the cellular carriers.
Right now, I have the best of both worlds. I am in the process of upgrading the Wi-Fi where I'm currently work-camping. I can get quite reliable 10Mbps service, in my MH, via that system. To take advantage of both the Wi-Fi, and Starband, I installed a Cisco RV042 dual-port router. I have the camp-ground Wi-Fi as the primary service with Starband on stand-by. If the Wi-Fi has a glitch, the router switches to Starband until the Wi-Fi services is restored.