I'd say it has significant value. Firstly, flying a taildragger - or more accurately flying take-offs and landings in a taildragger will develop and improve your handling skills to a large extent. Secondly, many of the most fun aeroplanes available to a PPL (to name just two, the SuperCub and the Chipmunk) are taildgraggers. Third, to anybody who cares to look it says that you are somebody with a passion for flying, rather than just somebody who likes being seen in an aeroplane.
Go for it.
G