I have a QC4 that has lasted me all of last year and shows no signs of slowing down. It was also part of that NR batch. I either got lucky or I should have picked up more of these!
I've got a 27EL utrip, good QC, returnable but w/out papers. Couple hundred swings. If I decide to part with it, I assume $225-240 is not unreasonable?