I have one of these and it's not a bad keyboard ... except the space bar ... it's hart do press 90% of the time or you have to press it twice. but i would recommend the MS Wireless Comfort Desktop 5000. i use one at work and at home and i'm in love with it.
have one natural keyboard at work another at home. Space bar is flawless! i can press with any force on any part of it.
then there's the comfort desktop 5000 or 7000 or some large number that i bought just to hack the "zoom" slider in the middle to be a mouse scroll wheel simulator... i ended up trhowing it away because i simply couldn't press the space bar anywhere! also, it was louder then the old natural keyboard (which is a huge flaw for both models. since they are all membrane and should be near silent)