Simply, it does not do what it says it will do. Add to that one channel of support, a forum, where nobody replies and you have a recipe for disaster.
I installed this on a client site after reading the one good review and was left with a trail of problems and unanswered questions.
Keep away from this extension!
Sorry you had problems Gary. It actually does do what it advertises, as evidenced by hundreds of satisfied users. We did respond to your email and forum-based requests, our last unanswered post to you was "I've just tested this and haven't found any problems. Is there a place I can see this (not) working? Thanks!"