Sooo, here I am again.
Finally, the package arrived. It was much bigger than I expected, with a lot of protective foam: they could have packaged in a much easier (and cheaper for them) way.
Back to the board:
The overall quality seems a bit better than PCBWay. In particular:
1) The routing was much better and precise (now round corners are actually round!).
2) I can't decide which silkscreen is better in terms of readability, compared to PCBWay. However:
a) The silkscreen alignment is very good (much better compared to PCBWay). For instance I wrote some "+" in the panel, in all layers (including silkscreen) and the metal and the silkscreen are perfectly aligned.
b) PCBWay used a very large clearance between pads and silkscreen, so they cut many text, which were "too close" (not that much) to pads. Instead, in this PCBWin run, the silkscreen is readable near the pads.
Still, (but that's a problem of my homemade reflow oven calibration), the silkscreen is more "sensitive" to high temperature, with respect to PCBWay (I mean, the silkscreen became a little bit yellowish. But you almost cannot notice it).
3) The solder bridge is present, however, I don't know why, between SOME pads of the same QFN chip there is no soldermask bridge! (see later about gerber edits)
However, some things made me a bit upset:
1) They edited my gerbers
For instance:
a) by adding one hole on the route tabs. Ok, this allows to break the panel by hand (I use a knife for my prototypes), but it's somewhat annyoing knowing that someone edits your gerbers, without even knowing the final application.
b) It seems to me that they reduced the stencil aperture of two pads (those of the chassis) of the USB connector... that's strange.
c) Instead, it seems they changed (enlarged) the soldermask aperture for some components :/ Maybe this is why between some pads the soldermask bridge is missing.
2) The stencil appears a bit thick. Ok, I have been stupid, because I forgot to specify the thickness. However I asked esplicitly "For any questions contact me please!", so they should have contacted me asking for the thickness. And furthermore, if you see fine pitch and 0402 components, you won't go for a very thick soldermask. Fortunately, the solder paste I use actually does miracles and it is VERY forgiving, and I got no shorts, no tombstoning, no issues
After reflow (i soldered one panel, i.e. two boards) it's working
I will post later some pictures.
A final rant goes to TNT: do not use TNT, at least if you live in Italy. They have a fixed import administration fee of 24.4€. VAT was 25.5€ (perfectly aligned to what I payed, unlike DHL). They almost doubled the VAT!!!
TNT, however, had the lowest shipping fee (10.4$)... I will check if other carriers are cheaper overall.
Cheers!