slingshot anonymous access?

Has anyone tried a slingshot subscription yet? It's a US-based ISP providing anonymous internet access (anonymous because it's pre-paid...no credit card required, you buy a cd from a store, use an enclosed code for access, and get 600 local dial-up minutes [or 200 ld minutes]). It's being sold at Staples and Compusa. Their URL is www.slingshot.com. I really like this idea of 'anonymous' dial-up access...very similar to pre-paid isp access ideas in europe. Are these business models going to survive long enough to invest my time/hassle to try this out? I know AOL, Earthlink, MSN, etc. rely heavily on knowing a little about their customers to drive higher CPM revenues (difficult to make money on sub revenues only). phillip