While I personally wouldn't buy it (I'm kind of picky about the tactile feel of the keyboard), you can get this fully functional Bluetooth keyboard for $20.
My only complaints with the A1243 are that the top row is half-sized, and that it has a useless eject button between F12 and F13 which can't be remapped.
Plus, I actually use the "Windows" key now, so its absence would be missed.
I don't use tilde much.
There is no absence of a super key. Its on the spot where alt often is, and alt is on the spot super often is. It shares key with shift.
The ctrl is where caps lock is on today's keyboards. If I have caps lock I rebind it anyway. So ctrl and super are easiest to reach, whereas the spot where ctrl often is is difficult to reach (there is nothing there on the HHKB).
So in short this keyboard assumes you normally rebind caps lock to ctrl, it assumes you never use the ctrl elsewhere. It assumes you use super more than alt. It is pretty close to a traditional Sun keyboard.
Funny thing is also, you can buy the keyboard without print on the keys, so that you can rebind it in any way you prefer.
What?? I use it all the time: Tilde in vim for upper/downcase and bash for home and backtick for jumping to marks and in JS for template strings. Great key.