My problem with the new page is that the thumbnails are smaller and the page is too wide. The old page was compact and you could see everything at a glance. With the new page taking up the whole page, it takes longer to go all the way over to the right of the page to get to sell similar.
When listing, any shortcuts we can use are important.
I also would like a default option, as I prefer the old page, and as it is now, every time I save a listing, I have to scroll all the way to the bottom of the 'new' page to click to go back to old page.