I got a Samsung 850 EVO 250GB SSD a couple of weeks ago for a new boot drive. I've been using it a lot, and it is way faster than my old Crucial C300 128 boot drive. I did do overprovisioning for the drive.

Eventually I'm going to replace my 512GB Crucial MX100 with a 1TB 850 EVO SSD. I'm far more impressed with Samsung SSD's than I am with Crucial now.