I've had mine for over a month now and very happy with it. I race inconsistently at times as far as frequency goes. Before this product I would cycle my packs the day before I knew I was going out. I no longer have to do this. I don't have to worry about my packs going too far gone. In other words I can safely store them without worry. Nitro season is big from now until October. This means that my electric stuff doesn't get used as much. I used to pretty much scrap my packs once a year since I never kept up on them in the nitro season. Sure they worked but all the punch was gone...
The Battery Nurse now has my back and packs are no longer a concern. Pull them out of the Nurse, tray them, charge them, and race. Full punch, full runtime.