I like some of the changes, but add me in as one of those who finds the addition of thumbnails next to the torrents unwieldy. Being able to turn that off was very useful.
The only other issue I have is with opening pictures while looking at a torrent, which now opens a new window in Firefox. I thought I knew what value to uncheck to turn that off as well, since I preferred the old method, but it didn't change it back.
Other than that, the option to change colour schemes would be nice, but is hardly essential.