I know I am not the only one here who has gotten a keyboard form Unicomp: http://pckeyboards.stores.yahoo.net/
In terms of prolonged usage: it takes some time to get used to, it really depends on what kind of feedback you want form the keys. Further reading [comparison of different mechanisms and the tactile feedback they give]: http://geekhack.org/showwiki.php?title=Mechanical+Switch+Key... [more force graphs]: http://geekhack.org/showwiki.php?title=Switch+reference&...