To me it just felt like it took longer to get to where I wanted to go on the web. If I want to go to a new page on safari I tap the webpage bar, type "E" and boom it recommends Engadget. With atomic I have to "X" out what is in the field before I can type "E" to suggest Engadget. Yeah that sounds lame, but having to do it EVERY time I switch webpages got annoying. And even though I can set it to full-screen on Atomic you still have the icons visible on the bottom. Plus, the search bar doesn't begin offering suggestions as you type, as it does in safari. I know there were other things that bugged me too, but its been a while since I've even opened that app...