[sgricci]

I used to love my Microsoft Natural Ergo 4000 keyboard. I did find that the pressure (PSI to press a key) goes up quite a lot after owning one for a few months, which can cause finger pain if you are coding for long hours.

After having MS Ergo keyboards for about 7 years, I finally switched to a Kinesis model (http://www.kinesis-ergo.com/advantage_pro.htm), and although more expensive, the pressure has stayed consistent for the 1+ years of owning it.