I like the one I got a couple weeks ago and this one is more than double the size and with the cupon it's $21.35.
I think a backup battery is a good idea, I just don't know if you can rely on the reviews. Perhaps it's fine, who knows?
This thing I was talking about last week dropped down to $16.61 so for that price it's fine it doesn't have a type-c to type-c port. I bought it. I'll play with it a bit when it arrives but then it will permanently live in my hurricane drawer and hopefully one day down the line I'll be happy I made the purchase.