I agree with @mijostyn that it is hard to know the difference, also because by the time you’re sending your cart for a retip it is starting to sound ratty. I will tell you that I am listening to a Soundmith retip Transfiguration right now and it sounds wonderful. I don’t buy used carts, but if you do, I wouldn’t worry about anything done by Soundsmith. But I think the price should be adjusted accordingly for non-factory work
Re-tipped stylus vs original manufacturer
How does a re-tipped stylus from, say Soundsmith or others compare to original manufacturer equipment. Assuming the stylus tip is identical and so is the material of the cantilever. I am looking at a Koetsu Black in the market with a stylus re-tipped by Soundsmith. I would think that if the re-tipped is identical, then the sound should be similar to OEM if the body and coil stays original but I could be wrong. Opinions please.