Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
The 830 is pretty fantastic. The problem with the 520 is price -- if we were talking 120GB drives, then Cherryville isn't too overpriced. But the 830 is way, way cheaper at 256. It's almost offensive.
I think most desktop users would be most satisfied with the 830.