Bests & Worsts Reviews from Amazon

I just wrote a long review of the Sandisk Extreme Pro 480GB, which I bought 2 of just before this model was released. I've now had two of these for about a week and I thought I'd compare them, because until these become available the Sandisks were what I was buying for performance. First, I haven't done a controlled performance test of these drives. However, if you check some of the good review sites (like anandtech dot com) and others, you'll find that the tested performance is almost identical. They are both very fine drives, and both have 10-yr warranties, which is a marketing issue, as you're unlikely to be using this in 10 years any way. At this point, I will continue to buy this one rather than the equivalent Sandisk Extreme Pro. First, it has more space as Samsung allows the entire 512GB to be used, whereas Sandisk only allows 480GB as they are reserving the difference for 'over-provisioning' whereby they have spare sectors to be used when (as happens with all SSD's) sectors fail with use. More importantly, Samsung's use of V-NAND indicates that the transistors (which are very different and what appears to be a huge leap forward) are more resistant to wear. This is clearly indicated by the fact that Samsung warranties the drive for a lifetime total of 150TB, whereas Sandisk warranties for 80TB. And this is important, as the 10-yr warranty means nothing if you exceed their total. having said that, techreport dot com is in the midst of a months-log torture test of drives and even the ones to fail first have vastly exceeded the manufacturer's expected limits, in a way that has surprised the heck out of everyone. So the bottom line is that even if 'used hard' as consumer drives, it's unlikely that either one will ever fail to perform well and long. One nice thing that Samsung has managed with the 850 Pro: Their earlier 830 Pro and 840 Pro were top-notch drives, butt their Achille's heel was their inconsistent performance, though this was more something noticed using test programs than it was something apparent to end users. But the 850 has corrected that. Also, if it matters to you, this drive supports encryption and the Sandisk doesn't. Is there anything that would make me select the Sandisk rather than this drive? Perhaps price. Right now, taking into account the usable space for each drive (512GB Samsung vs 480 Sandisk), and the prices as I write this, the Samsung is about 77 cents per GB and the sandisk is about 70. For a 10% difference I'll go with this drive. However, given the huge positive publicity this drive has gotten, I suspect that Sandisk will have to lower prices to keep their Extreme Pro moving, and since both drives are so good, that could sway me.