I'm disappointed by the color depth. And the full specs don't match on some of them for memory and screen size. Without that I can't decide which is best. Some of them approach my desktop computer in speed and processing power. For example some have 64 MB RAM and 400 MHz chips with memory stick slots. So I'll bet in another year my desktop will be surpassed by the average PDA, maybe even cell phones. And a few more years before eyeglass displays show up in stores. They are a little expensive right now ~ $2500. The photovoltaic fabrics are still in the research/patenting stage.