I have never seen a negative comment regarding the quality of work done by SS or regarding their professional integrity. The only "negative" comments are in relation to timeliness. Because the business is so good and so successful, they sometimes get backlogged, and this is apparently irritating to some customers. Personally, I have no sympathy for those complaints, because Peter L is generally very forthcoming about the turnaround time, in advance.
I had SS re-tip one of my Grace Ruby cartridges with their OCL stylus on a ruby/sapphire cantilever. The cartridge did not sound "right" when I got it back (within the estimated time interval). It was shrill and the midrange was recessed. I thought it just needed break-in. But after 10-20 hours, it was still pretty awful, not as good sounding as my other OEM Grace Ruby sample (original equipment is ruby cantilever with elliptical stylus). Peter invited me to return the re-tipped sample for his inspection. He found an error in the reconstruction, fixed it, and had it back to me within a week, with his apology and at no charge to me. The SS re-tipped cartridge now far outshines my OEM sample.