POFI company has designed our own EDM holder to suit 3R and Erowa. Compared with EROWA & 3R, we located in China, we can help investor cut a lot of cost. Yes, there have some comments on the internet, using the base components from different company makes its cost may more higher due to quality problem. No, you don't worry about this problem if you choose POFI products. all holder sold by POFI company are guaranteed by quality, also we promise 100% compatible with EROWA & SYSTEM 3R.