It is annoying that it removes the ID from the URL. It would be nice to bookmark my own code and I can just open it on multiple devices whenever I want to transfer a file. However I need to do a bit of gymnastics with the QR code to grab the URL.
Codes are intentionally single use, to limit the bruteforce vector. And only two peers can connect any given time currently. It would be interesting to figure out how to make it work with more than 2 peers!