OK, now that I've had a few hours listening to:
Meat Loaf's Bat Out of Hell II: Back Into Hell
Pink Floyd's The Dark Side of the Moon
King Diamond's Abigail
Many Random Songs On Shuffle
I've come to the conclusion that these headphones kinda rule. It's hard to compare them to anything else I have because they're so different.
The bass doesn't seem as tight to me as they do on the Shures. The only description I've used when describing it has been like a "marble" within the music, not overwhelming the other music, but standing on its own. This "marble" can be heard on the LiveWires, but it doesn't stand out as much. Maybe it needs a "burn-in" period before it the bass tightens up, but I'm just going by how they sound now.
Also, when I open my mouth really wide (like a yawn), I lose the seal in my right ear. Not a huge deal, considering they pop back into place immediately. So, unless I'm eating at the time (which sounds bad with IEMs, anyway), there won't be any issues there.
I need to test it out on some Dream Theater and The Beatles to get a true reading on everything. I'll post some more remarks (and pics) in the next few days when everything sorts everything out.
But, starting out, these things rule!