I did not experience any dropoff in performance - which I have confirmed now though testing. This is true for both drives - which perform as they did before the flash.
OK, thanks man! just to make sure I did not misunderstand you - did you have to do a reinstall of the OS or anything like that? Did your ssd die after the fw update or not? Mine did not die after the update, it just became slower .. so that is what I was asking you. To compare with you and with the speeds you got. Did you successfully update the FW and now get same speeds and IOPS or did the fw update mess you up and you had to reinstall the OS and then now, only after a reinstall of the OS, you get the normal speeds of the 850 pro?