I have not got the Quattro yet, so this may change.
The OPN has the most natural pleasing sound. Discrimination in speech was slightly better than Linx3D.
The LiNX 3D has the better accessories as I stated. The LiNX does NOT make you feel like you are in a tunnel. The steering algorithms are simply different. Oticon is trying to train the brain by throwing everything at it…to a degree. It isn’t like an analog aid, but it doesn’t steer its processing as tightly as Resound. I am very curious to see exactly what Resound has done with the Quattro.
I will be getting that one and will let you know. Just pm me in a few days