My mother had it for over 6 years, and while it worked (about 75% of the time), it was more of a PITA than it was worth. Speed was terrible, daily cap at the time was 200MB per day, shortly after it was moved to 400MB per day. Which with 4-5 people surfing that did not last very long. Not to mention it was very expensive for the service she received. She canceled it and went with the VZW mobile hotspot. 10GB a month, which is almost double the amount they used to get. Not to mention speeds upwards of 4-5MBPS with 3G, and with 4G on the way the speed will only go up. She is much happier and it is about $10 cheaper per month.
I would not recommend it based on my experience with it, but I know sometimes you have no choice. Metrocast wanted $9500 to run cable from one side of the road and over $13k to run cable from the other side. They say that the potential customer base is not worth the initial investment, (from one end is a huge Amish community).