I just got mine. Like Gurdipurdi, I'm also trying to avoid sounding like a "kid-in-a-candy-store" but I have to say that I am impressed!
I had the opportunity to pick up some cheap AKG K702s the other day and I jumped at the chance because I was worried that my Sennheiser Momentums would be too low impedance. I tried them out with a few sources (DAPs and Laptop) and I did NOT like them. But at the price I got them, I decided to give them a couple of days to see if (brain) burn-in would help. But then the Little Dot arrived. Plugged in the AKGs and...my word, what a sound! I've no idea if the Momentums will work okay or not - I couldn't stop listening with the AKGs long enough to try the Senns out.
My long-term plan was to get some HD600s, but I think it's going to be a lot longer before I'm willing to give up the AKGs than I originally thought!
Also, 5 stars for the service provided by David. Patiently answered my queries about any possible problems with the Momentums' impedance and shipped it in record time.