I have a pair of the new AW220's currently in my system. They are only 4 months old but have been left on the entire time and have worked flawlessly. Your listening preferences will determine if you like the new products better than the old. The previous models sound mellow, slightly tubelike and musical. The new versions are more dynamic, highly detailed, revealing and transparent. Several friends have heard these amps in my system and are blown away. I have to agree. If I had the choice of old vs. new, I'd take the new hands down.
I also have an ECI 3 integrated in my second system. It's the older version and really sounds quite good. I am however, having the upgrade performed on this unit next year. I have not compared these to the other units you mentioned however I would suggest you contact Stewart at Sanctuary of Sound as he carries the EC's and Pass Labs.
Good luck