That's good to hear. Unfortunately when those points were launched amid massive fanfare they all stopped working just days later. I was putting an iMiev through its paces and got stranded there!:-(
Queensgate ones definitely free (and the parking is free after half five at night too) and no card required at all (you use your parking ticket to activate it - very clever) as I used one yesterday. Park Road and Car Haven might charge depending on which card you use.
Naturally no fee for mine if you are in need