The product works fine under Windows XP (Home, SP2) and Linux (Fedora 8 kernel 2.6.23). A delay in the transfer of data between PC and keyboard I could find _not_. I tested due to lack of hardware but only the transfer from the keyboard to the PC. The only flaw if you want to call it that is that quite bright power LED also lights up, if the PC is off. Otherwise, a very well-rounded. Plug in and start playing ...