Does anyone use an AT & T wireless card???

It is beginning to look like I am going to have to go with At&T if I get any high speed connection. Even they do not have DSL available in our area, when I talked to a rep today, he told me if I had cell phone service, I would have the wireless Internet.
I do have service on my cell phone here, but it comes and goes. It picks up better outside than inside, so I am wondering about how well it would work, he did tell me I could try it and would not have to keep it if I didn't like it.
The other upside to AT&T is anywhere cell service is available, you can use your laptop.
I wish someone that has it would help me try to make this decision. It will cost 50.00 a month to use it when I bundle it with my home phone.
Thanks, Sandra