Thanks for the reply Dee. You said:
"Example: An SSD with the Sandforce controller may take hours to actually carry out the NAND block cleaning, whilst the Barefoot 3 controller inside the OCZ Vector series will clean the NAND blocks very quickly, and this is why the Vector is able to maintain its writing performance extremely well."
OK, but what about the Samsung 850 and 950 Pro Series SSDs that you have reviewed? Are they also as quick in cleaning the NAND blocks as the Barefoot 3 controller inside the OCZ Vector series that you mentioned?