I amusing the hd650's and 598's. the amp is really amazing and I am loving it so far. Also I have to add that JAck Wu is great to deal with. I originally went with the little dot because David is great to work with as we'll. Customer service goes a long way for me.
The LD2++ Served me well for a very long time but I was getting the itch to upgrade and had the funds so I went for it. One thing I do know is that I will most likely not upgrade again because I can see that there is a point of diminished returns. I find it hard to believe that spending more money again will give me much more then this amp offers.
Also I am thinking about some new cans as well, never tried Beyers so I think I might look into a pair.