The thing to remember is Chromebooks are built around a very basic operating system that's designed to be safe and essentially virus proof. The new "Stream" computers are built around Windows 8.1 which is pretty darn safe, but not foolproof. A "Stream" computer will be slower to wake, generally want more resources, use more power, and still have all of the negatives associated with a Windows based machine. The advantage is you're getting a fairly low cost Windows PC that can use Windows programs and not rely solely on apps. Of course you're not getting much in the way of memory or CPU power which still limits the programs that can be run.
If I was buying a new laptop today, I'd probably go with the Asus 13" Chromebook. It's nicely priced (generally $179-$229) a decent size, and gets very good reviews. I just think the Chormebooks are a better option now than the Streams.
Fly!!! Eagles!!! Fly!!!