Just got the cradlepoint 350 and it's like magic - somehow it automatically dials (which I used to have to prompt).
Setup was easy - plug it in and figure out what the password is (actually had to read the directions)

3 things

1) luckily I have an unimited plan but I guess if I had a limited plan no one else could use my connection if they didn't have the password (is that right?) and I don't use data when connected but not transmitting (I assume it is connected somehow all the time even though when I use the usb directly in the computer it disconnects after some period of lack of use)

2) I have to change wifi networks when I want to print as I am using an airport to print wirelessly

3) I have to find a wifi usb or pcmcia card for my oldest (but still working) laptop

Thanks so much for the help!