I also use the Verizon air-card with my Toshiba laptop. Works great. I signed a 2 year agreement, canceled my home high speed connection through my cable company I lost some speed in doing so, but I simply use the air-card at home as well as on-the-road and find the connectivity, speed and reliability to be just fine for all I do - including downloading some very large files, such as software releases.
I got tired of libraries and the charges some parks charge for wi-fi, not to mention their reliability issues. I'm happy with what I have and the monthly bill I pay ($60).