I've only seen the M-400A/A2 FCOs in parking lots here. They are oddballs, thats for sure, but nice GE lights. I like the M-400A2 because it still resembled the 60s M-400 (from far away, as the PC socket position is the same) and they were virtually a modified M-400A. I'd like to get a M-400R2 someday too. They're in use widespread on RIDOT freeways but with the threat of LEDs, I wonder how much longer they'll be around. The Cooper OVM is another one I'd like someday.They're also used by RIDOT in the mid-to-late 80s but not as common as the GEs are.