I have now had a really good look at these controls and continue to be very impressed.
Having access to the source code is great, and having them written in VB is even better.
I have made my own little test program to evaluate these, it crashes quite often in the IDE but the compiled EXE is file.
Here is a slightly expanded list of bugs, issues, and requests for additional functionality.

ucBrowse

1 Double update sometimes giving noticable flicker

2 Not consistently getting focus (click the listview, then pressing up/down arrow on keyboard
does not always send these keystrokes to the control.)
ucTree has similar issue.

smaller issues

3 Selecting a file with .SelectedFile = name is case sensitive
Probably better if it is not, or could this be an option????

4 When selecting a file then if it is not visible it does not become visible
(user needs to scroll to find the file)
Automatic scrolling to make the file visible would be good, an "EnsureVisible" method even better.

>>>>>>>>>>>>>>>>>>>> Extra Functionality.

ucTree

5 An EnterFocus event.

6 a SetFocus method equivalent to SetFocusonFiles in ucBrowse

7 "Show Hidden" functionality similar to ucBrowse

8 a property to disable the right click menu.

ucBrowse

9 a method to select an item by location, in paticular to select the first item.
(maybe I can already do this?.....am working on it)

ucBrowse and ucTree

10 Control of cursor/highlight colours
...when I say cursor I mean the highlight bar showing the selected component, not the mousepointer

Its a different shade of blue in ucBrowse and ucTree.
Can they be the same? even better can this be a user property please?

(you give user control of the background colour so it would make sense to have
user control of this too?)

and what would be really good....

when the ucTree/ucBrowse does not have the focus the highlight bar becomes a very light
grey colour (at least on my PC), could we have a property to control this colour too?

11 Rapid Update/refresh problem.

When navigating the ucTree rapidly with keyboard up/down keys the ucBrowse can sometimes not
update quickly enough and the updates stack up.
I have had a look at my current LogicNP controls to see how they behave....
If clicking a folder in the Tree then the list/browse updates imediately.
If navigating with the keyboard a short delay is built in (I estimate about 700msec) and the list update
only occurs if no other navigation has taken place in this time.

12 Possible issue with "My Computer" display, more details later