I did a 3rd yr amputee placement just before Chrismas, using the femurett most days with good results. I tried to find research on it, but my supervisor said there is very little around. I did find this one though:
Ramsey, E.M. (1988)"A clinical evaluation of the LIC Femurett as an early training device for the primary above-knee amputee" Physiotherapy, Dec, 74 (12) 598-601