This has been a god send for our forum. Previously, we were manually editing topic titles with "SOLVED" in the title. This is so much more useful, efficient and visually obvious.
I love that you can assign it to each forum with different attributes. We primarily use it for the "SOLVED" feature as we run a hardware support forum. But we also have a subforum which allows users to sell their hardware, so we use the extension to mark "SOLD" on those topics.
I have one request, and it may be too much trouble... would it be possible to add a second mark for a second word or phrase that could be enabled on each forum? In other words, I use the check mark to mark a reply as "SOLVED" for a particular topic. But we also have many topics that we believe are solved, but have no specific reply from the original poster which would verify that - many users come for help, get the help they want and never return to tell us they solved their problem. If we could mark those as something else... say "WAITING" or "ON HOLD", we could easily, visually identify which posts were still open to support and which we think are probably solved, but are not certain.
Of course a simple solution (in theory) would be to create various sub-forums for "SOLVED", "UNSOLVED", "ON HOLD" or other topic notes, but that would kind of defeat our current board structure.
Anyway, thanks for a great extension!