What problem did they have? I had a Ford with a 5R55E in it. I don’t recall reading about any issues with them.
The 6F35 had an issue with one of the pressure plates breaking, resulting in some very hard shifts between 3rd and 4th gear. I also experienced it when shifting from park to drive or reverse.
The DPS6 actually had a lawsuit against Ford they were so bad. For some stupid reason they kept the clutch dry and that could cause catastrophic failure in some dangerous situations.