First off, the Forum here needs "2.3" added to its version dropdown.
When I imported my UTW tags into 2.3, it went and imported them with dashes instead of spaces (as this is how UTW stores them, IIRC). Trouble is, 2.3 seems particular about keeping those spaces, even if I try to edit the tag to ditch the dash in favor of a space. The importer would work better if it just turned dashes into spaces.
Secondly, any time a category and tag name overlap, I'm forced to use the same capitalization as in the category. I like my categories capitalized and my tags un-capitalized. This seems to be impossible now when there's overlap.
Sorry if I'm being nitpicky, but this is the type of stuff that keeps me up at night... ;)