with any version of Windows.
I've used it since it was first launched and have nothing but praise for the service. At the very beginning there were a few teething problems, since when it has worked perfectly, day in and day out, without a hitch.
Worth the cost? well that's a subjective thing. If you use the Internet a lot it certainly is - you'll be online for as long as you like without incurring extra call charges, and your phone/fax will still function as before - effectively it's like having two lines on one. Added to that you'll be surfing at many times the speed of an analogue modem.