I have owned the MAD Super HD for the last 18 months, I run a high end analog system through it, using Senn HD 800 and have been very happy with it. I am however thinking of upgrading to the WA5 LE with parts upgrade etc. I can now afford to do this as I have sold off my Cary 805 Anniversary power amps, and Shindo Aurieges, due to moving soon to a smaller abode, I will have a Headphone only system , so I may as well make it the best possible. But I would like to know just how much better it will be, as this MAD Super plus HD is very impressive. Any advise or suggestions. I am in the UK. We don't have the abundance of Headphone amp makers here that you guys in the US have.