This is a Chinese version of the Witschi from Switzerland. So far, I have not found any deficiencies, but I have only used it on three ETA/Valijoux movements to regulate. I put my 116710 on it as an example. This model cost was in three figures, wheras Witschi is well into four figures. People who work with watches every day use Witschi, but for the hobbyist like myself, I find the device to work well.
-Sheldon