Free Commander

Pros: This has the best interface and routine functionality of all the dual-pane browsers. After years as a sysadmin, there is still nothing I can't do with FreeCommander.

Cons: If I had a choice, I'd go for an open-source cross-platform tool.

Overall: I've been using computers since before Norton Commander hit the scene. The dual-pane model has stuck around for 40 years now because it's a brilliant design; and there are some excellent file managers in that category. Unfortunately, the others all have issues.

* One Commander uses its own theme, regardless of what your OS uses. Also it violates the fundamental 'tab-to-switch-windows' paradigm.
* Double Commander is free, open-source, and cross-platform. Awesome! It also looks like crap by default. Keyboard shortcuts sometimes match what you'd expect, but not always.
* Free Commander looks and feels like part of the OS. It Just Works. If you need to do complex things (group rename for example), it can do it. If you need to invent weird problems, it can deal with it. I've never met a problem I couldn't address with FreeCommander. Maybe the others have comparable or even better functionality; but this does everything I've ever needed and does it naturally.

After years of using the free version, I spent a few weeks trying the competition. Then I deleted them and became a donor to Free Commander.

This is my favourite tool, and should probably be yours as well.