I see both Dr. Nutt and Dr. Rayner at TWID, and recommend both! I have a complicated, multi-faceted health situation, and I've never doubted both doctors' commitment to helping me figure it out. In fact, they often do outside research to help me. One of my favorite aspects of working with both doctors is they communicate with each other about my case, so if I have an appointment with one, they've already gotten the most recent updates from the other.
I've worked with them for about six months now, and I waited to give feedback before now because the six month point is usually when other doctors give up on my case and dismiss me. My health journey looks like one step forward, one step back sometimes due to complications, but I know Dr. Nutt and Dr. Rayner have my back and that's made a tremendous difference. I've gotten more answers with them than any previous physician so far (and I've seen a ton).
I recommend the TWID team, and regularly do so to friends.