Has anyone ever used a foam-in-place seating (FIPS) for wheelchair patients?

My siblings are considering purchasing this for our soon-to-be 97 year old mother. She has suffered 3 to 4 strokes in the past 7 months and is in steady decline. She lives at home under the full time care of my brothers and sister-in-law, with part-time paid care givers. She also has had hospice care since last October. It looks like a great idea. I am interested in how well received it is by the wheelchair sitter. Mom is super paranoid about anything new.