I am a long-time user on windows desktop and have always used opera as my main browser because of the minimalist style and tools. Opera One for me is going in the opposite direction. Module structure might be okay but nothing really useful compared to what could be done before, with the problem of "gaps" between icons and sections reducing visibility. Of course you just have to get used to it and it all goes away, but besides that, in the short time I have had to try the browser I have also found some things work worse, the main one being the ads filter that no longer works on some sites such as youtube. Unfortunately I went back to 99 after 10 minutes....