I've gone through 4 of these over the years. The ergonomic "fit" is wonderful for someone like me who works on computer all day. However, the less than "excellent" is because I'm on my 4th one for little quality issues, like the last one got a broken lift-leg on the backside, causing it to rock and not be the right angle. Seemed very flimsily made and so top quality is just not there. I would have LOVED to report here that I've only bought one.
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