Hi, I’ve been practicing with a bow right for 6 weeks now and it does make a difference. Before I watched myself in the mirror but was never able to really understand how to bow or at what point I did it wrong. Now with the bow right, I could immediately feel at what point and on which strings I am going wrong. It’s definitely a great help. And when I take the bow right off I still bow straighter than before. So, after some time I won’t need the bow right anymore and will be able bow straight anyway!! Good luck with it!