Can only speak for myself - I read with Sincerity somewhat regularly, but with QOC I had one bad reading with her and that was enough to not go back.
For context on QOC, I called her 7 years ago when my ex and I were broken up. At the time we were still talking but he was also seeing another girl (name starts with a K). I asked if he and I would get back together and she said no and that he had feelings for someone who started with the letter T. That was me and I told her but she insisted it wasn’t me. My ex and I did get back together and stayed together for years. We broke up for good 3 years ago and the next girl he dated he married (her name starts with a C), so idk wtf her prediction was about.
With Sincerity, she has been super accurate with me. Predicted my current job (told me the letter the company would start with along with my boss’ name prior to me accepting it). She’s also picked up on other stuff I wouldn’t even mention or have ever spoken to her about (trips, an almost expired passport, and a specific type of dental work I needed). She’s also been super accurate when I call about a man also.