The products I have critiqued and partly redesigned include an infrared digital camera, a 100 MHz ultrasound system, and a paper currency recognizer for the blind. I provide special skills to complement those of your employees. You save on overhead, office space, and equipment resources. You can avoid much of the hiring process, and get quick, reliable results. My rates are reasonable, and there is no continuing expense once the job is complete.
Time is always at a premium.
Unfortunately, people often lose time by hurrying. Once the prototype begins to work, the pressure to begin manufacturing is heavy. Still, an independent, unbiased design review is very important. If the documentation is complete and the design sound, the review will be inexpensive. If not, the review will save your company a great deal of money.