I recommend it for SSDs because there are a lot of cheap SSDs out there (especially the small ones) that aren't much better than a usb stick. Not many people are using a Samsung 850 Pro for their OS.
Very interesting... I had never thought about using the flash-memory plugin with an SSD... but it makes sense. Assuming an SSD supports trim, would you still need (or should you anyway?) to use "discard"?
My OS drive (80gig 2.5in sata drive) has developed the click of death, so I know it is on its last leg (just replaced my data drives about 3mo ago w/ 4tb drives)... I was surfing ebay tonight and looking at some prices. Given what you're saying, I might go ahead and go w/ an SSD.
I'll have to give it some thought.