Did the longer route, definitely saw 11K+ riders total. Great to see but hard to read some of the comments as it scrolled so fast. No issues for me personally. Lots of troubles happened from middle of ride with people saying their screen or rider froze. Also riders looked they were pulling off to the side or stopping, so definitely a lot of glitches for them. I noticed I was about 4000th place or something and when the problems started I jumped almost 2000 places!
Many suggested if they haven’t been on in awhile to jump on ahead of the event to update Zwift since there were a few new routes, kits, etc. Other than that, same flat London route if you haven’t done it awhile. But good to see so many riders for the New year! Only time will tell how many keep it up!