Thanks to their new "Dynamic Write Acceleration" technology, which was pioneered on the M600, Crucial's new MX200 SSD manages to increase performance over the MX100 while still using exactly the same controller and flash chips. In our real-life testing, we see a 3% performance increase averaged over all the benchmarks, which lets the drive claim the title of "fastest SSD we ever tested". However, 3% is not much, and I doubt you'll be able to notice the difference in day-to-day usage, which tends to focus on read speeds. It is still a clever move by Crucial to lure in buyers who end up paying the competition too much because they think the MX100 is not fast enough for them. No more!
With a current retail price of $140 for the tested 250 GB variant, the MX200 ends up $35 more expensive than the Crucial MX100, the best SSD on the market in terms of performance per dollar and price per GB. Crucial also enabled an additional overprovisioning capacity of 6 GB on the MX200 (vs. the MX100), which reduces the MX200's price per GB rating even further.
Personally, I would still buy the MX100 because its price is just too good. Things might be different if Crucial were to somehow bring the MX200's price tag to within $10 of the MX100's. Yet if I were building a super high-end gaming PC, the increased cost would probably be negligible over that of other components, which would turn the MX200 into a great option.