@Anthony
Have you left it to charge batteries unattended or overnight? Not that I do that even with DJI Charger. I am just concerned about using 3rd party batteries and chargers for primarily two reasons, safety, and damage to batteries.
Hi I never leave charges of any kind on over night ...
But I have used this a number of times to charge all three batteries my RC and a battery bank, the charger did not get Hot just warm to the touch ( cooler that the DJI block ) and charged every thing in just under one hour. My batteries were at about 20%.
I have used it about ten times since getting it and have not noticed and drop in battery performance but I think it's to early to tell.
What I wI'll say is that all the charging intelligence is in the Mavic batteries and not the charger so I'm not expecting any huge issues.