I had a few hours to test the console and I must say, I am overall disappointed.
Positives first:
Very good HDMI output (it even remembers the last 16:9 or 4:3 setting, which is a surprise)
Convenient form factor and nice design (though I wonder why the woodgrain is orange?)
Convenient to use IF it works
Very little lag
The CPU seems powerful enough for newer Stella versions
PAL ROMs work well too (though the picture is somewhat small for PAL50)