mrkgnao: It's too buggy for me to trust at the moment (e.g. had to reload three times until the cart item showed up), so I didn't actually make a purchase, and therefore got no feedback link.
P.S. A clever way to ensure mostly positive feedback: anyone who cannot use the new checkout at all (not me), also cannot fill a feedback form.
VanishedOne: If it's any consolation, I left deeply negative feedback. On my 17" screen, the use of space is wildly inefficient: only a few games are visible at a time, and then you have to click a 'choose a payment method' button because the payment options now replace the list of games. Perhaps it's intended for people who buy their PC games via their mobiles.
Yep, same spreading of that infectious disease that's pushing mobile design on desktops there too now, with huge target areas for small touchscreens, a lot of wasted space... And indeed, no longer just having the payment options listed directly on the sidebar is likely the worst change, at least at first glance.
... also says at the bottom that by purchasing I confirm I'm in Poland, which must be a mistake, since it obviously sees I'm in Romania according to the prices I'm getting...