Eudorajab: I am not a batten expert but I'll provide what little I know. First, some listers may be interested in the purpose of battens in the first place. The luff of the main is supported by the mast, the boom supports the foot but the leech would have no support were it not for battens. The main would be as limp as a dish rag without battens so that is why we have them. Full battens give better control of the leech than partial battens and that is why they are becoming more popular. Obviously, they are more expensive than partial battens and they require special engineeringto build. They come in various stiffness and flexability and your choice depend on the type of weather you sail in. Additionally, your choice for the top batten pocket is very important. So, if you are sailing in lite air and want more power and curve you would use a flexable batten. If you are sailing in heavy air and want less curve and less power you would choice a stiffer batten. I checked with my sail maker in Torrance, Ca to determine the advantages and disadvantages of full battens over partial batten. He told me full battens are quieter and easier to flake. They give a better shape and hold it better in lite air. The disadvantages are that if they are not properly designed they will jamb at the luff and the sail tend to chafe against the shrouds when running. Lastly, there is the expense factor but he claims they are more durable and therefore last longer. Eudorajab, I'm afraid I have not been much help. You will have to press your sail maker for more information as he is the guy who built the sail. You paid hard earned money for his product and you deserve some answers. The bottom line is that you have to get the proper set for your sail or you'll never get the trim right.