Just now putting together my rma return for one of these to B&H. My 6th SSD drive and by far the worst. Windows freezes on install, slow speeds on new z77 chipset, sluggish performance, hiccups and glitches, just not what I am used to in SSD. Put my Crucial M4 back in place and smooth sailing.
I had to RMA my 830 to Samsung also. Super slow read speed. The one they replaced it with is running better but still not as fast as advertised and what I'm getting from my Crucial M4.
I'm a bit mixed feelings on Samsung SSDs now unfortunately.