You will probably not give a "WOW" response because the 650 has nothing that really stands out, but that's exactly it's strong point.
I agree with canoners. The beauty of the HD650 isn't in your reaction the minute you put them on. It kind of builds as you listen for an hour and don't want to stop. Or when you listen to stuff you didn't particularly like all that much with your old headphone but now it sounds Wonderful. That kind of thing.
You'll find overtime with experience that cans that fail to impress initially are actually the good ones. The ones that really grab your attention on first listen tend to be coloured and fatiguing in the long-run.