By pure coincidence I've just bought one of those from here. I am using it for mobile computer training in village halls, church halls etc. where we do not have a t/p line. Because it's a long term commitment we went for the 2 year contract so the device is free but it's Ł10 a month. Yes, it works well with Skype, I tried it last night. I'm in Colchester and we are getting a speed of 250kb. In London it can go up to about 7mb.

Check your download limits and coverage on the 3 site before you buy to make sure it works in your area.