I just want to share that after 2 years of use and a clean install of macOS, My 960gb M500 drive suddenly got really slow, below HD speeds. With some difficulty. as I couldn't even make a USB-disk of the MU05 update that would boot my PC laptop, to which I moved the M500, and I had to find a CD and somehow managed to find an old RW, burnt it and boot and applied. Then I removed the CD and left the PC running with the M500 for 8 hours or so, nothing obviously booted or in use as this is a Mac partition. Now tonight I moved it back to my MacBook Pro and write and read speeds are around 400 MB/s. Garbage Collection when really idle seems to work fine. I'm contemplating activating trim, but I want to check for sure macOS Sierra's trimforce doesn't send queued trims as I understand at least Linux distributions with this could damage the drive. It says so in Wikipedia.
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