The only minor drawback I encountered was the lack of proper documentation. In practise that could easily be rectified with a single tool-tip as there is only one thing to do wrong.
DO NOT ADD FULL URL when adding pages. ie for www.yoursite.com/photographs you only add /photographs into the box.
Oh and a longer keyword field please!
Thanks for using Tag Meta.
In the next release there will be larger fields (e.g. keywords) and a manual with detailed examples. I see that all negative feedback are due to a lack of documentation, and it's a pity because Tag Meta works well if you know how to use it.