Capt Marble - I agree - I use them for email only. A lot of people, however, use them for land-line and mobile telephone calls, although the company I deal with is cheaper still. Some use them for 'casual' Internet access.
I cannot therefore comment on their actual performance apart from not getting ANY email traffic and not being able to access their portal to check service status yesterday for several hours.
I was really trying to ascertain whether I had a 'Bill Gates' afternoon or the network had a problem!