I have to disagree. The only similarity is that it is also an ergo-design. The inward bowl is hard for me to use. A guy at my work has one and due to the way I

I have to disagree. The only similarity is that it is also an ergo-design. The inward bowl is hard for me to use. A guy at my work has one and due to the way I hold my hands, I can't accurately press any keys in the lower left qwerty layout (shift, z, x, c, ctl, alt, etc). Not to mention, it is absolutely huge with so much space it the middle that feels wasted. I would pay good money for an identical layout to the microsoft ergo 4000. If I had the know-how, I would consider building my own.