I have not had this long but am impressed so far . There does not seem to be much competition in this price range for 73 or 76 weighted keyboards. I use it with a computor and also with midi with a Roland VR09 as a light weight set up for smaller gigs.
The Acuna is used for the acoustic and electric piano on the VR09 and handles this well.
The action is good , not as good as a dedicated top range digital piano , but it is not nearly as expensive and the build quality is good for the money with a metal casing which feels professional enough. It uses the same action as some of the Nord pianos which may be a good thing depending on your veiw of them. It is more like the early Yamaha weighted actions
but as I say ,good for the price.
My own opinion is that this set up is at least, if not better than the Nord HP73 , at less than half the cost.