Hi Ladies, I also had Allergan 410FX 495ml implants. The FX stands for full height and extra full projection. They are the tear drop shape. It is about 16 months since my exchange, and they are reasonably comfortable. So much better than the expanders which were hard and seemed to have corners or creases in them. Because they appeared to sit unevenly I asked my PS to sit me up before he finished to check that my permanent ones would be level, and they are. They have softened with time, but they are not soft they real breasts. My PS said to expect them to keep improving for at least 6 months, but some will soften up to 12 months. Mine aren't hard like the expanders, but they feel rather like the external prosthesis that I wore for a few months prior to my reconstruction. My hubby is pretty happy with them and has never complained about them feeling hard. I have my cleavage back which is great, and there is no sand paper feeling or anything like that. My exchange took place about 3 months after my expanders were put in. Good luck. Love Chris xx