Call me paranoiac! Call me antique! Tell me whatever you want, but THEY MUST BE OUT OF THEIR MINDS if they think I would leave ALL my stuff on THEIR SERVERS.
It might be faster than blinking, but I simply DO-NOT-LIKE the paradigm they're trying to spread.
It reminds me the "old" ATM machines, when a mainframe did all the processing. I guess I don't have to recall it was a bank who owned the mainframe and that you must pay them periodically.
I think the idea of avoiding the startup delay is really cool, but has a SMALL detail.. data is stored on GOOGLE servers, which means if Google powers down their servers you cannot access your data.
Tomorrow Google could say, "ok, since now you must pay to use our services.." And that's when you regret your decisions. I haven't mentioned the fact they can do whatever they want with the data in their servers (yeah.. yeah.. the data confidentiality agreement - i don't think so).
Nevertheless, I think it might be suitable for some people in some cases. Computers would require less hardware, which is a pro.
In summary, I like the idea of speed up the OS, but I think some stuff is private property and must remain as such (at least for my stuff).