Hi, all!
In regard to the useful application of IWR, the two most important keys are: (1) patient assessment, and (2) risk/benefit analysis.
(1) The main question is: How badly is the patient affected? What is the result of the preliminary diver neuro exam? What is the current physical state of the diver? What was the extent of the exposure, i.e. gases used, time/dosage, etc? What is the prognosis?
(2) Are we prepared for IWR? Are the environmental conditions acceptable? Is there better help, i.e. chamber and medical staff within reasonable transport time and distance? Please note the word "reasonable" here. The farther you are away from shore-based or platform-based recompression and medical help, the more reasonable IWR becomes IF, and it is a large IF, (no pun intended) you are prepared for it!
In general, unless you have the set-up, the training, and the staff to assist, IWR is more dangerous to the patient/diver than surface 02 and transport.
It is, however, as Fins pointed out, a personal decision.
BJD :doctor:
(FYI: Just as a foot-note, I am a certified Diver Medic Technician and the course included study of the practice of IWR.)