Was able to navigate this presale, but took 15 plus minutes ... each time i submitted my order it told me that someone else beat me to it.... had to cycle through 8 times to get the tixkets.
this is by far the worse part of this experience: on the seat map, they show seats as "available" when in fact someone has them in their basket (so they're locked, unavailable). so you put seats in your basket, attempt to lock them, get a "sorry, another fan has beat you to it", and you need to start over (including a page reload). super annoying.
i must have attempted to purchase 20 different seats for thom yorke, and finally i stopped trying to get the best seats available and picked something a few rows back from the best available. those eventually went through.