My screen works perfectly well and it really *feels* different. The previous screen had a more "plastic" feel, always greasy. Now it feels like my yfather's Lumia 630, had no problem at all.
Look at my video, the important thing is that I can get these 2 circles as close as I want, and separate them again (pinch in and out). This was impossible before.
The situation doesn't detoriate in time, it feels as good as the first day since repair. I don't know if a capacitive screen should register 10 fingers ; I mean, the Surface 2 registers up to 5, and it's not a low end device. I rarely use more than 3 fingers on the device anyway.
So my advice would be: if you have issues with 2/3 fingers in multitouch, like in my "before" video, bring it to the Care. If you can't pinch in to the max/pinch out without the screen losing track of your fingers, bring it to the Care.
I consider I have a new device since repair, it's really a pleasure to use it ; I was afraid to use it before (click registered instead of scroll, etc.), it no longer occurs.
And again, the screen feels better, in terms of legibility and pure sensation, than before repair.
The only issue is to be sure that the repair supply chain in Spain is now aligned with what happens in France, Germany, Italy. I've read other reports from France stating their screen was changed, and they report exactly the same drastic improvements as I do.