I had an 7yr. old SHE 55 M 12 UC/64 model , which I liked a lot and replaced it only because I changed all my appliances to stainless.
the only complaint with having the 3rd. rack in the new machine is that no stem glass taller then 7" will fit in it unless I lower the 2nd. rack which has 3 adjustments.
Having lowered the 2nd rack to its lowest level, then the washer arm on the bottom of the 2nd. rack, hits the top of my 9 and 1/2" dinner knives and 11" dinner plates, so for me that extra rack in not very useful for me.