Hey @Anders,
In a general sense, yes, our plugins are compatible with qTranslate. We have many users who use qTranslate.
However, there are some known conflicts and there may be issues with specific features; any feature of qTranslate that affects actual URL rewrites, for example, may cause problems…
In summary: our compatibility with both WPML and qTranslate has improved greatly since that original thread you posted, and it’s worth trying them out on your site to see if it works. But there are still some issues and there is not 100% compatibility at this time.
I hope this information is helpful!
Cheers,
George