2007/09/14:
known deficiencies:
  1. a single action (global search and replace) may produce N actions that need
     to be individually "undone". This can be annoying.
  2. pasting large blocks of text via X, etc can be far too slow.
  3. opening files larger than 5-10k can be very slow
  4. the minibuffer can't get larger than 1 line when it wraps
  5. tab completion, etc doesn't pop-open a completion buffer like it might
  6. if you get confused in the mini buffer it can be annoying

2007/07/15:
reverse search is all fucked up.
* maybe fixed now (2007/07/18)

2007/07/15:
sometimes you don't get search-as-you-type (and have to hit C-s an extra time
to see anything).
* possibly fixed (2007/09/26)

2007/07/12:
sometimes searching seems to save the wrong cursor position, or not overwrite
the previously used one, and you end up finding matches *before* your search
started.
* possibly fixed (2007/09/26)

2006/07/04:
undo/redo is mostly fixed, but there are still occasionally problems, which seem
to relate to pasting in multiple lines and cursor positioning.
* i haven't seen this in awhile (2007/08/01)