Went to Warsaw, Poland with a Panasonic GF1 and came back with an X1 (last few from London)
Very impressed with file quality and handling. Yes - it is a little slow, but not a problem for me at all.
All raw, processed in Lightroom 3 Beta - some are cropped - mostly only very minor levels adjustments [since discovered LR2 currently better quality)
http://www.flickr.com/photos/17684878@N06/sets/72157623527901986/
My instincts are that the file quality much better with X1 than GF1 (mine has the 20mm 1.7). Always felt a little noise present in GF1 even at low iso's. Not happy with GF1 after 400/800.
X1 really is DSLR quality - fine up to 1600...3200 under bad lighting is ok as well.
X1 lens is lovely, esp with wide aperture closeups.
The GF1 feels bulikier, is much heavier (and feels more solid as well)
X1 is much easier to carry around due to shape / size / weight - fits really well in hand, but feels flimsier than GF1
X1's handling much better (because only a fraction of GF1 menus and options to wade through)
X1 almost silent (a slight click can just be heard in a silent environment) - you can be invisible when taking pics - GF1 clacks loudly, giving game away.
"Loosness" of dials a non issue for me - firmer than on my old CM.
X1 is a picture taking delight - it feels like a camera rather than a computer.
Only thing I'd want addressed in firmware is proper focusing scale on LCD. Not sure what Leica were thinking....
Otherwise manual focus works well.