Using opera 10 at the moment. It displayed the forum incorrectly yesterday but it's working fine now.
The compression mode is a nightmare, it downscales images. I couldn't even recognize the 'go to new posts' button in front of a topic name at 3* compression.
The graphical display of a page could be nice, but for me it's just too large. You lose about 150 - 200 pixels of web page.
Features I miss: ctrl+click to open in new tab (still is shift+click) and indeed an ad blocker. The transfers tab rocks though, finally no annoying separate window like in firefox or even windowS in Explorer.