Thanks, another really needed app like Xee :).
Seems to work fine until now here on OS 10.4.7 PPC, but it didn't associate itself to archive file types although I selected all file types in its preferences. I suppose I should associate them manually, but I'll wait because it lacks one feature important to me: choosing a default unarchive destination.
As far as I can see, it currently unarchives files in the same folder where the archive resides, while I prefer unarchiving them on my desktop. Is it a planned feature for the future?