I would surmise that a lot of the ones in the US are coming from Europe anyway...
Johnny, PM sent, but for the eyes of everyone else:
Yes, I use my Core a lot for a few reasons. It writes the finest (and most consistently fine, and wettest-per-fineyness) of any of my pens. It's an XS nib, by the way. I just got a Hero 930 cheapie that writes similarly like an extra-fine, but this comparison bolsters my use of the Core. I also like the way the cap snaps. I understand why people dislike snap caps, but the snap-cap on the Core has not opened up accidentally, nor is it difficult to open. I'm also getting the hang of placing my fingers on the grip, which is becoming more comfortable. (A gripe, though: you can't really begin writing with it until you rotate the pen to the right pace to grip it. Other pens take less time to begin writing because you can comfortably hold them crooked and then twist it into place as you write...)
It's mostly used for when I need to write in small places... But with an Eternal ink, it might become my labwork pen, as I drip liquid on lots of things (often water or ethanol on my gloves! or from drinking so much tea!) and i really can't have my datasheets smearing. Nor my lab notebook
Now, how about that Galileo ink?!!!
PS: I posted a picture of my Core
on this other Rotring Core thread so that you can see the orange weird plastic piece that dislodges the cartridges (and makes a mess!)