They're here and they're on my head. They sound nice and flat. Boy, they're hot on my ears. That will remind me to take regular breaks, if only to cool down. I'm trying out different reference mixes I'm familiar with to get used to them.
I'm using my MacBook Pro audio output A/B against my AudioBox USB headphone out. So far I haven't heard a difference – this seems odd. I'll give it more time.
One thing I'm struck by is how nothing gets in anything else's way, aurally. It's all there, even in the mixes I did before this using only SOL ear buds! I guess the Senns will be good enough for a novice like me.