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Looks safe Rated 3 out of 5 stars
The entire download is an XML data sheet, not even a true extension. It adds a search engine to your search engine list, *definitely* not something that can override your homepage or hijack your browser.
As for how good the ringtones are, or how cheap, I can't say. Didn't download any of them.
Not complete enough a package to be safe Rated 1 out of 5 stars
Looks dodgy. I suspect any redirecting homepage, but the whole package here is promising a lot without much accountability if they hijack your system.