Your review feels a bit like an affiliate sales letter. In case this is an affiliate product, you should disclose that.

On a substantive level, I think all file managers should have tagging, smartly filtered collections (a la itunes "smart folders", but more powerful), and built-in full-text search. On top of that, a rules engine for copying/moving around files (e.g. move all downloaded pdf's older than 15 days to the trash). Ideally, this stuff would be higher level than the file-system, thus allowing cross-platform use of this system.