Have had several people that had Honda replaced packs fail in less than a year.
The opinion is that about 2-3 years ago they started rebuilding packs with used sticks, and that means much shorter trouble free service. Most of the people I spoke with got a charger and discharger, and the success has been very good.
May need to give it a booster shot with a cycle or two every couple of weeks, to keep it in the zone. ( frequency dependent on the actual battery condition)
The main difference between the GCO1 is the 1A charge rate, VS the 0.35A charge rate with the smaller chargers. All other functionality is the same, all can operate the discharger, and all will record the cycling information.
Typical reconditioning cycle: 5000mah Pack
pre cycle Soak charge GCO1-GCM1-GCIM1 ~ 17 hours
Discharge cycle 1 ~ 2.75 hours (depends on actual capacity)
Recharge cycle 1 GCO1 ~7H GCIM1-GCM1 ~14.5H
Discharge cycle 2 ~2.75H
Recharge cycle 2 GCO1 ~7H GCIM1-GCM1 ~14.5H
Discharge cycle 3 ~2.75H
Recharge cycle 3 GCO1 ~7H GCIM1-GCM1 ~14.5H
GCM1-GCIM1 ~ 68.5 hours
GCO1 ~ 46.25 H
In actual reconditioning, one will likely see the AH increase with each cycle, so the actual times will be different based on the capacity of the pack.
The install video for the harness is here: