I played with Commander One, it's a good start, but has a long way to go; I would keep an eye on them for sure and hope they continue to improve. I was hoping to avoid using something like PathFinder or ForkLift which seemed to 'heavy' and overkill for what I want. Kind of like using a Humvee when all I want is to drive to the corner convenience store; i.e. I need to do one or two things, go, in and out, done. However, I have finally settled on PathFinder. It provides most of the things I like with TF:
1) sidebar on BOTH sides of dual pane
2) colored sidebar, but not only colored icons, it uses the custom icons I've assigned to my folders. There are other apps which say they provide colored icons in the sidebar, but it's only their own default icons they've chosen, or Apple's default colored icons stored in the System/Library/Coretypes.bundle file, and only for the most common folders (Documents, Download etc); PF displays my custom icons I've assigned for ANY folder OR drive. FYI, PF comes up by default with a black/white sidebar, to get it to color you actually have to create a NEW sidebar, make it your default, then delete the B/W one. Not obvious, but once you know the trick....
3) multiple tabs across the top
4)status bar at bottom
5) full path displayed at top with custom icons, so I can jump quickly to any folder up or down the hierarchy
6) Drive icons on the sidebar or at the top if I want.
7) sort the sidebar categories any way I want, i.e. sort Devices, Shared, Favorites as groups, not just the individual items in each group. For example, I like Favorites listed first, then Shared volumes, then Devices last.
8) speed. PF has improved much in responsiveness since I tried it last many years ago. No it doesn't pop up as fast as TF, but good enough. Now I just keep a PF launched all the time, and minimize to the Dock when not needed. And once the window is open, the file functions perform as fast as TF, at least on newer Macs. On my older, slower Macs PF is not as responsive, but I'm not upgrading my old Macs to El Cap anyways, so I continue to use TF on those.
9) I don't use PF for the other things like torrent, FTP, access to cloud drives etc, so no comment there. I'm use to using other apps for those functions, so my use of PF is primarily as a local file manager, the same as I used TF.
this is just my personal opinion, YMMV, each to their own. Kind regards.