The next one I tried (in the second picture) I think cost about £35 and this one was not GPS based but ran off a connection to the OBD II port on my car and also fitted the socket on the GS, which is the rectangular socket required by the Euro 4 standards, unlike earlier bikes which have a round one. While this worked reliably on my car it sometimes wouldn't start up on the bike, and seemed to need to be reset, and once I did some longer rides with it fitted I found it sometimes stopped mid-journey so couldn't really be relied on. When it was working it was very accurate because it was driven from the ECU and displayed the correct speed without the deliberate over-reading that the speedo introduces. It always agreed exactly with those radar road speed signs your see, and was also in close agreement with the satnav. it would also read engine temp and battery voltage, plus it had a rev counter display, but sadly this only read up to a maximum of 6000 rpm, presumably because most cars have their red line about there.
