I had the same initial reaction, however I did sign up for the free plan with a great deal of skepticism. The performance was actually quite impressive, all things considered. Since I already have a significant amount of virtual and dedicated infrastructure at my disposal, and I live most of my life on the command line, I don't have much of a use for it. That said, it does seem like a very neat concept, and if I had more options for distributions and desktop environments, I'd consider renting one if only as a test machine for the rare graphical software I do run.