I bought the 1TB version to replace my 250GB Samsung EVO 840 originally fitted. After an uneventful clone, boot times to the desktop were erratic and significantly slower than my original drive. I thought that a clean install might cure this but after populating the install with my usual programs (this took over a day) the same symptoms were displayed. I can only assume this is due to the inferior transfer rates to the Samsung, particularly the random IOPS.
With hindsight I should have paid a bit more for the Samsung EVO 860 1TB. I am now using the crucial as a secondary drive. Lesson learned