I had bought recently with BitsDuJour help and been trying to use only this for couple of days and I must say: it takes me back to Total Commander more and more each day.
One of the reason, obviously, is the fact of being long time TC user (10 years?), second is - lack of features I need like:
- custom columns - XY has 12, Windows Explorer 41, TC hundreds; I can switch between saved list view configurations any way I like,
- previews and thumbnails for lot more filetypes than standard explorer can handle; I admit TC has WLX plugins (MultiLister is the best here) but it can also call XnView or IrfanView via WM messages to get data from them,
- no freezes on large directories - if directory contains dozen of executables XY freezes (I have antivirus exclusions for it already), if there are non-standard (i.e. PDFs) thumbs… freezes again; can't it load thumbs/icons in background and cache them?
- TC can browse inside archives while XY calls WinRAR; couldn't it support ZIP and RAR at least?
- and if I click on thumbnail it would be nice to have it selected, not only the file name which gets unseen between dozen of thumbs.
OK, enough complaining for today

Something in plus: mini tree view is just awesome and it would be even better to have it implemented with list properties like these:
http://www.codeproject.com/Articles/23746/TreeView-with-Columns
http://www.codeproject.com/Articles/14741/Advanced-TreeView-for-NET
http://www.codeproject.com/Articles/93/A-TreeList-Control
Another idea: more Excel-like features for files list and you have a winner.