I wondered about the potential impact of the site redesign on sales and gathered some stats. I've looked at four categories of browser use (US desktop, US all browsing, World desktop, and World all browsing). I've broken the six main browsers (chrome, safari, firefox, ie, edge and opera) into two groups, working (chrome, safari, opera) and not working (firefox, ie, edge). My primary criterion for "not working" is showing price on the front page as without that, I just leave. There are various other examples of lack of functionality that are associated with this symptom. This is primarily a functionality analysis, not one based on design. There are many reasons to be suspect of the numbers and I've listed several below. This does however provide a baseline from which you can draw your own conclusions. Browser usage stats come from gs.statcounter.com and the version info from www.w3schools.com. Firefox is a little tricky because later versions show the price and most use later versions. It could mean as much as a swicth of 4% (all browsers) to 9% (desktop) from the 'not working' category to the 'working' category based on the primary criterion. However, the site still lacks functionality for the latest version. Numbers don't add up to 100% since other browsers are ignored. All data taken from Sept. 2018.

(sorry about the formatting. gog overrides my spaces)
Browsing Category Working % Not Working %

US desktop 72.2 27.3

US all browsing 82.0 13.9

Worldwide desktop 75.9 21.8

Worldwide all browsing 78.8 9.9

Chrome dominates usage (~50-70%) so that bolsters the working category. Going from desktop to all browsing, the biggest changes are decreases in firefox usage and increases in safari.

As mentioned above, there are many factors that make these numbers suspect. Off the top of my head:

* Overall browser market share may not be the same for the game buyer community on the whole.

* Overall browser market share may not be the same for those that buy games on gog regularly (older buy more? older more likely to have "older" tech?).

* The version information comes from a developer website and may not match overall or game buyer distributions (e.g., they have Chrome w/ ~ 80% share and the largest share the other place has is ~70%).

* Some may be willing to tolerate the decreased functionality

* Some may be willing to switch browsers temporarily from their preferred one for Gog.

* Not seeing prices might not defer some that use the site differently

* Variations in functionality issues exist. Other issues may decrease usage.

* Other browsers not included

...

Based on those factors, overall, I'd expect these numbers to be worst case in terms of 'Not Working.'

This analysis only measures functionality, not preference. Based on the early threads, a certain percentage will stop visiting regularly because of not liking the design. With time, one would expect that some would return because of upgrading browsers and more tolerance of inefficient design (as such things proliferate). I don't know what kind of increase in traffic is expected now due to the new design. Whether that increase and recovery over time is worth the potential loss of UP TO 10-25(+others)% is a business decision I'm not in a position to make. Certainly, that decision would include many other factors as well.

TL;DR Shareholders beware.