Hello,
its true that its better to enable AHCI before installing the os in order to have automatically activated Trim and all the other functions of the ssd and keep the best performance of the drive. Although there is a fix to enable it later on it can mess up teh registry of windows really bad and will cause the whole system to crash so i recommend to do it with a fresh installation.
And at the end its true very nice SSD i have also one in my pc to have a backup.
Good luck.
