this be my second Ergo 4000 and I really could not be happier -lrb- well if it be wireless that would be sooooo awesomer -rrb- . I buy my first one after 4 month of be a software engineer . I write code for about 8 hour a day -lrb- 9-5 , m-f -rrb- so my wrist start to hurt after a whole day of typing . I buy one of those keyboard cushion and hate it . I find this keyboard for sale on , I think , Newegg and have be love it ever since . that keyboard be still work just fine but need to be take apart and clean -lrb- all keyboard need to be clean , ew -rrb- . I decide to buy a new one and take the old one home for use in my ` home office ' . I have spend hour and hour try to find a replacement that I would like . saddly split ergo be not in fashion any more . I have try the Wave and play with a bunch of logitech keyboard but the only one I have even think about switch to be the  Smartfish Technologies K2418B Reflex ErgoMotion Keyboard  that and people complain about the cramped numberpad which I use a lot . I even try look for a split that at least have some kind od padding like the 4000 but all I find be either gel or plastic . I end up come right back to this one . it may not be stylish as a logitech , or as solid as a 80 's mechanical keyboard but this thing still beat they all at comfort and reliablity . actual review : the key be pretty silent but I type kind of fast and hard so there be some muted clacking but it be pretty light . the key themselves have a matted feel to they and spring back up when you press down . you do not need a lot of force to press but you know you press a key . rarely can you accidently press a key and not know you do -lrb- never happen to I but I guess these thing can happen -rrb- . there be review about the how you have to press near the center of the spacebar to register a `` space '' but I have never have that . the spacebar be oversized and my thumb rest directly on it without any effort on my part . some split key board have the two spacebar or the oddly shaped one but this board have a oversized one that spand the entire split . I have never set up the `` my favorite '' key so I can not comment on those but I see somewhere online that you could substitute macro rather than \* . exe or homepage . -lrb- if I find it again I 'll edit this post . -rrb- the zoom button I use rarely but only when I need to up the font size in Notepad + + . I use the hell out of the volume and calculator button . the play button work in iTunes but be really mean for Windows Media Player . the volume control be mean for the system sound not as a media player control . my programming enviroment do not recognize the '' = '' \/ '' -lrb- '' \/ '' -rrb- '' key find above the numberpad but this be due mainly to such old software -lrb- vs6 -rrb- but word -lrb- even 2010 -rrb- see they . con : the only real complaint I have be that there be no real wireless version . the 7000 I think be wireless but you need to use the mouse and I have no need for it -lrb- I use a Logitech vx at home and a MX at work -rrb- . and just a note , depend on what OS and hardware you be on the volume control can take up to a 3-4 seconds to adjust the volume . I be pretty sure on a fast system that you will not even notice a lag if there be one . remark : after 5 year of solid use the key that be oringally matte be now shiny and a few letter have rub off but the keyboard still work just as it do the day i first set it up . it be be to 3 different company and survive 2 move . the pleather\/leather be still the same color as it be , no rip , no fading , no tear apart , no little piece flake off , etc. . a rubber foot do come off but that happen like a few month ago which again speak volume about the overall construction . and the little lead light on the bottom still work ! I 'll post a picture of they side by side later so you can see what I be talk about .