HH-65 topped my list for dreadful seats.
The seat in a B206 or 407 is sheer luxury compared to the HH-65A. HH-60s and AW139 pilot seats aren't even in the same galaxy. All 3155 hours in the HH-65 A were excruciating. For one, no lumbar support, no thigh support, and in forward flight, the seat itself declined downward a few degrees, so you had to strap yourself in to keep from sliding out of the seat and typically also held yourself in place with your legs in all attitudes besides the hover... continuously. If you were lucky enough to sit in the left seat, the pedals were offset from the centerline of the seat about 4" to the right... sheer pleasure... old blindfolded HH-65 pilots tend to walk in circles as a result.