Is my "Samsung SSD 850 EVO 500GB" defective (or just incompatible with MacBookPro5,5 Yosemite 10.10.2 - 13 inch mid-2009)

Question

Is the Samsung 850 EVO not compatible with this MacBook Pro? Has anyone installed it and found it to work fine for a few months?
Has anyone faced boot-partition corruptions, problems when installing Yosemite updates with this SSD - on reboot, SSD partition became unmountable for me after the installing Yosemite update 10.10.2 (14C1510).
I am trying to understand whether
mine happens to be a defective drive - in which case I have the option of getting a refund from seller and ordering a replacement (same make+model), OR
I should return this one and go for a Crucial/OWC/other SSD
Details:
MacBookPro5,5 Yosemite 10.10.2
Samsung SSD 850 EVO 500GB
I purchased this drive and installed it in my MacBookPro about a week ago.
Since then I have repeatedly run system-reported data corruptions on the SSD.
One obvious sign of the corruption is that on powering-on the laptop, it will stall for a long time (5 to 30 minutes! - normally it would boot up in about 30 seconds) after the grey/black Apple-logo and status bar appear on the white-background boot-screen.
Another way I see this is by running Disk Utility's 'verify disk' operation.. Reports serious errors and asks me to reboot in recovery-mode with Cmd-R to repair the partition.
I have erased and re-installed the OS (Yosemite) several times on it already because sometimes the Recovery-Partition's Disk Utility cannot repair the errors - asks me to backup and erase+format. The repair operation does not always succeed *.
This is happening often and without any pattern **.
Several times on the latest install, I have booted up in single-user mode and run fsck -fy: till yesterday, this was still occasionally finding and successfully repairing issues (after which I run fsck a couple more times to confirm).
Seems to be running fine today.
* I am re-installing off of a TimeMachine backup.
But I don't think that is causing the trouble: verify-disk on the original backup reports no errors, and even the computer itself passes "verify"/"fsck -fy" several times over before failing in the same way again after an hour or 2 of actual use.
** On one occasion, after an OS update (latest OS X security patches) succeeded and reboot completed, verify-disk again asked for the Cmd-R recovery-mode repair - which failed to repair the errors.
Also, if I as much as launch the Yosemite installer while booted up, then even after quitting (without proceeding beyond the initial screen), the SSD fails completely again requiring to be erased. Happened twice with installers involved, but corruptions even without installers did happen.

Answer 1

I loaded the Samsung 850 into my 2012 i5 Macbook Pro and it's been working well since I installed a few days ago.  The only concern I have is that on boot up I get a white screen for around 30 seconds before it begins the startup with the apple and progress bar.  That's odd, because when I installed an SSD on my older 2009 Macbook a few years ago that laptop booted up almost instantaneously when I pushed the power button. 
I loaded the system on the SSD by cloning, rather than using Time Machine and it worked without a hitch.  Used Carbon Copy Cloner in trial mode after formatting the SSD with Disk Utilities.  Not sure if your problem may stem from using Time Machine.  The cloning apps will usually adjust the data on the new drive based on available space, so if your SSB is a different size than the original HDD, it would automatically correct.  Not sure about TIme Machine.
I'll keep researching about the startup lag when I turn on my Macbook Pro with the 850.  Seems it should boot up right away with the SSD, but maybe it's because the 850 uses the new vertical stacking configuration.  That's the only thing I can think of that's different from the last SSD I installed in my old Macbook.