I bought one. It is not a great keyboard. But for $16, is it a bad buy? I ended up buying a keyboard a few weeks after trying this out because there were too many tradeoffs.
First, it often lagged terribly - like it had gone to sleep and then recorded like 12 of the same letter and spewed them out when it woke back up. Mid sentence. It would look liiiiiiiiike this allllllllllll the ttttttttime.
You have to hit FUNCTION (FN) in order to access the ESCAPE (ESC) key. I use esc a LOT. And finding the FN key, and then hitting the ESC key was not going to work.
You have to hit FUNCTION (FN) in order to access the DELETE (DEL) key. If you forget to hit FN, it will lock your computer as the default function for that key is LOCK COMPUTER.
Similarly, all of the function key ‘operations’ are default instead of the actual F1, F2, etc. So, whenever you try to hit F4, you have to first hit FN.