It works like a charm. BUT...it does interfere with the online entry form, if it is attached to the same site. I opened my sweet 16 tourney for entries last night. I opened a entry page, partially filled out the bracket and waited. The auto refresh wiped it out.
So, I keep two TTHeader.html files handy - one without refresh for entry periods and one with auto refresh for use when the entry period is over. I've also had some cache issues in the past....I'm thinking the auto refresh will take care of it.