I've just received my first review period extension as a Seller.
I'm a music producer and the delivery consists of a 17 seconds length of intro music. The buyer had 72 hs to check it. 2 hours before automatic completion, the buyer requested the review period extension; now, instead of 72hs, it is 192hs (8 days).
Not only this shouldn't be a one-sided decision, but also this shouldn't be free for the buyer.
And finally, it should be applied depending on the delivery content.
I don't think this is a good idea, at least not as it is right now.