We have the IMC for at least 4 more years. How often do you fly? Would you fly more often if you could fly in poorer weather or in same weather but above cloud? Do you want to be a better pilot? If you only intend to fly a few hours per year it may not be a winner in the value for money stakes until you need the extra skill that you would undoubtedly acquire. In short, Do It! you will not regret it unless perhaps you really cannot afford to fly very often at all. You would only need to revalidate every 25 months.