i have a question, if i default my Wii U back to factory settings, will it also take it back to pre update?

No problems here. I think it might have froze once.

I really don't know, but you can try. and if back to first sw version you always can update it later

Doubtful. But it might.

Haven't had any issues so far. The faster loading times have been much appreciated though. Hopefully they'll speed them up a little more still with the 2nd update in July/August, plus increase the system stability and what-not. Only game I've had freezing/crashing issues with is Sonic & All Stars Racing Transformed, and that was BEFORE the update. Haven't played it since the update to know if the problems still exist.

I have trouble starting Netflix. The screen will go black but the loading music will play endlessly. I have to unplug the console to get restarted. The only solution I have found is to go into the eshop first before loading the Netflix app. I think somehow the system now only gives the impression that it is faster by having stuff loading in the background. The Netflix app apparently does not know that the server is still loading in the background and it therefore freezes when it cannot connect. By the way I have tried uninstalling and redownloading the app.

I can confirm the Need for Speed problem. Ran silky smooth before but now it stutters all the time, even lost some races because of it. Monster Hunter already had a horrible framerate and the update certainly didn't fix it. Haven't tried any other games.

I can also confirm difficulties with the Netflix app.

Only issue I've had is a suspiciously long pause before launching software. It'll pause the plaza for ten long seconds before the load screen for a game shows up.

I haven't played NFS since the patch. I launched it to check the rumours and it had an update. The frame rate still feels smooth, but the game has more aliasing than I remember it having before.

I haven't had any problems except for the Youtube app still being broken but the only game I have played on it since the update is New Super Mario Bros. U.