I think their 4G LTE is eating other Telcos/Cableco's cakes. I've cut the landline in my office (small biz) and home DSL/cable and solely rely on my cellphone in both locations. I save almost $200 monthly.
My initial plan was to try this for a few months and if the quality/convenience is not up to par, I'd switch back. I'm with this rig for a year now. It' even easier now that share-everything is available.