Still using the mx100 happily.
Yeah, using 2x512GB myself (bought when on sale for $175 at newegg). I still have to navigate the mess of (now buried) info to figure out if I can get raid + trim to work on this mobo; I seem to recall the workaround with this chipset being a PITA. Was hoping I could just push it off until skylake, but that seems to be getting farther away, and not closer.
Crucial's mx series doesn't cripple speeds between models , so it should perform the same.
The mx200 doesn't because of dynamic write acceleration (M600 stuffs). That was the fatal flaw of the mx100 though...everything below 512GB performed worse, granted not badly enough to say they weren't worth their cost. The 512GB was/is still to an extent a pretty well-respected drive for it's kick-ass value, and according to what I've gathered, still a better mix of cost/size/performance compared to the mx200 250GB, while the 500GB MX200 is only slightly faster than it (while losing 12GB and costing substantially more).
The mx200 is overpriced imho. I feel confident recommending the MX100 512GB for size/value, the 850 pro/evo for performance, and/or waiting for the BX100 models to level out in pricing for absolute bottom-dollar value. It sounds like they will be cheaper than the mx100 ever was, and given not only are they the same speed to slightly faster than the 256GB mx100, but also that the mx100 was already the cheapest drive around in many cases...not a bad replacement (other than the outlying 512GB model).
I think this is a fair roundup of what I've been seeing in reviews:
http://us.hardware.info/reviews/591...-hardwareinfo-ssd-performance-scoren2013-2014