Good, but sensitive to heat
I used this adapter for a long time because my motherboard didn't have a built-in network card. There's nothing to complain about in terms of performance, it even picked up reception upstairs with the router on the ground floor (I can't say anything about speed as I have a country connection, it's always slow whatever the equipment...).
On a tower, however, I'd strongly recommend plugging it in at the front and not at the back, even if the back seems more practical, as it's very sensitive to heat and loses the connection during more intense gaming sessions (oops).