I keep a couple at work for when I suck up to the boss and make him a coffee.
As an espresso drinker I cant fool him like I can the others with milk based drinks.
He likes them. They look very nice and he knows Ill take any constructive criticism.
No complaints so far.
I make sure I preheat them with a hot water flush before pulling the shot to ensure that they dont cool the shot down.
The steel does not appear to affect the crema.