The only downside is the bulkyness of the case. The only flaw i can point out is that the case can only charge at about 9 watts.
This new battery case is thinner than my previous case. If you're someone who loves their iphone 8 but worries about the potential for damage or struggles with a lackluster battery life, i strongly recommend investing in this extended battery case.
Long term durability is in question, though i’ll never be able to say, because it is going back or in the trash! This is the most disappointment i've experienced in an amazon purchase in a very long time. Returning it. Difficult to reach the seller.