Thanks bro! I've heard sorensiim talk about the quickstep too, but I never knew it was available in europe.
It's only €285, which is dead cheap (if it's actually better than the O2).
Today I got to test the C5+DX50 in the train. It's wayyyy too big and heavy. And the worst thing is, I really don't notice the added SQ when I'm forced to stand in the train because it's so busy.
So I'd rather carry around the pico amp, or quickstep, with some dual lock on the back and attach it to the DX50 when needed.
I think Quickstep would be safe choice. First of all, Made in Germany Also there is a discount for the moment. Back in time I asked ClieOS which amp is the closed to O2 but portable instead of transportable, he suggested strongly Quickstep. I was about to order but then I purchased SE5way and no money anymore