Not personally (our service bought ours outright) but I know Masimo gives a whole bunch of support in getting these grants. Have you spoken with your local rep?
Do you have links to those studies? I'd be interested in reading them.
Most of what I've read about them (as well as my own experience) has been favorable. Usually false readings are easily traced to operator error (the most common one is that the black plastic boot that goes around the probe gets taken off because providers don't realize that it's there to protect against ambient light (it uses a much wider spectrum of light to analyze MHbPA so interior lights can throw the readings off).