To be honest, it would really depend on how good you are looking after your car and cleaning it regularly. If you are not one for regularly cleaning, then it may well be an option to consider. Having said that there have been some horror stories on here where some people who took up this option had really bad problems with the application. Water marks from wing mirrors down the side of the car, which were impossible to remove, for example.
You see, it's ALL in the preparation and getting paintwork perfect, free of water marks, scratches, swirls, etc BEFORE applying the supaguard. If this is not done right then you are left with all these marks underneath the Supaguard, which, in order to remove, would mean removing the supaguard.
Personally, I would not choose it but in the end it's your decision.