fit n finish on this charger are better than i thot china could do. if the insides are as good, it will last forever. this thing is not easy to program, but i'm learning. my batteries tell me i'm a nice person. i'm charging at .7. it's faster than my nitecore but the batteries stay room temp. they heat up in the nitecore, aging. i have probably doubled battery life by only charging to 4.05. i have exactly the same run time. before, i charged batteries when they were down to 50%. i was in error about how important that was. by low charging i only lose 10%. so, i'm using them down to 40%. so, everything is the same, but batteries will last. if they ban sale of batteries not in a pack, this will be a big deal. i haven't tried the test functions yet, because i'm slogging thru the manual. they have online tutorials you can access by scanning these designs in the manual, but i don't know how to do that. in all, i think the mc3000 is worth the money.