Ive been making flemish and endless loop. I have also heard some say they do not like flemish strings, but it is usually due to the weight. With glass bows, most guys like to use a fast string. That is the only reason I can think of being an issue. Acutally, a flemish string, with a heavy material is better for you bow, due to its extra intertia. Not as violent on the limbs. As for problems caused by a flemish string, I have never heard one. I actually shoot flemish strings on every bow I have right now.