The Athena 11 speed rear mech is a beautifully made and very durable piece of equipment. I know this because I owned one that did over 75,000km of all year round riding, wet and dry, winter and summer, before it was destroyed in an accident involving a car. Even after 75,000km it still cleaned up to look like new and it still shifted perfectly. These mechs are a little heavier than the next model up (Chorus) but they are every bit as well made. The pivots all have proper bushings, unlike some of the cheaper mechs, so the parallelogram remains free of excess play. They are compatible with all Campagnolo 11 speed shifters up to 2014. I have also used them with 2015 Chorus shifters and an 11-25 cassette and saw no degradation of performance.
The bottom line is that there really wasn't much motivation for anyone to fork out twice the money for a Chorus rear mech while these were still in production.