This isn’t a comment about competing products (except in terms of price), but I use the free Izarc application for my zip needs (which, granted, are not terribly demanding). It’s got pretty decent support for file formats and a familiar interface. I’m guessing it’s probably slower than WinZip and WinRAR for larger files, but I don’t compress/decompress large files all that often. I think it’s a solid app. I do have one complaint, though: it, like other apps, uses what I’d guess are non-true type fonts, so they aren’t compatible with ClearType. That’s a MAJOR pet peeve of mine, although not a deal-breaker for these kinds of apps.