Tim, just get the bl#$# sail out of its bag and use it. Then let your own experience or frustration tell you exactly what is wrong with it for you! Believe me, you will notice the shorcomings when you are ready for them. In the mean time you probably will have saved up enough money to buy yourself whatever solution you need.
You may be a beginner right now, but I can't imagine you want to stay that way all your life, right? So whip out that sail and have yourself some fun while the season still lasts.
Dennis