Over the past 18 months I have purchased and used multiple drives in my 13" MacBook Pro. I have been on a quest to find the perfect drive that is reliable, affordable, offers lots of storage and has great performance. So over the past 18 months I have had: 500Gb Seagate Momentus Xt Drive Crucial M4 256GB SSD Cruclal M4 512GB SSD Samsung 840 500GB SSD I figured I would write up a little about each one which hopefully helps people decide of a decent consumer hard drive solution. Seagate Momentus XT 500gb: I bought this drive after reading some decent reviews and really have nothing but good things to say about it. Sure copying and transfering files is no where near SSD speed but once the drive learns your favorite apps, then it launches apps very much like an SSD drive. The downside is im not sure what it does under dual boot situations. Which OS does it choose to learn and adapt too? I also saw a mild battery hit when using it. When I made the move to SSD, I wasnt nearly as impressed as I would have been coming from a normal 5400rpm drive because it offers some great SSD like features. I would give it an 8/10 (if it fits your needs and your just a consumer) Crucial M4 256GB SSD: this was my first SSD and it has been reliable and just works since I bought it. Sure its not as fast as other drives but the failure rate was much much lower than other drives and reliablity is huge thing for me as I tend to use my laptop for work a lot. Once I had a full SSD , I knew I've never let my self go back to an HDD. My Macbook Pro 13" (early 2011) couple with 16GB, absolutely flies with this setup. It feels much much faster than my iMac at work even. I would give this drive 9/10 Crucial M4 512Gb SSD Because my experience was so good with the 256gb M4 and I was running out of space, I decided to buy the M4 512GB on Black Friday for 310$ (after rebate). I took it home, cloned it and then popped it in my MacBook Pro and all was well..... for a few days. I started to notice an weird issue when my system would become unresponsive when I plugged in an external USB drive or Firewire drive. Well just 9 days after buying the drive, i plugged in a USB drive and my system once again froze but then this time never woke up. The drive became totally unrecognized. The drive shipped with firmware 010G (which I stupidly put on my 256Gb too when i noticed it was out of date) and Im guessing that was the culprit. But none the less, I can't have 9 day in failures on my drives and it really ruined Crucials good name for me. I have to give this drive a 2/10 Samsung 840 500GB SSD: When the M4 512gb failed, I was able to return it to the store and use store credit towards the purchase of this 375$ drive. I was very skeptical of this drive because it uses a cheaper nand but I read very positive reviews from anandtech and others and in all the benchmarks I saw, it outperformed the M4. And so far, its lived up to the hype. Its been amazing and reliable. My only grief is that their is no firmware update solution for Mac (to even download a bootable disc, it needs to be on PC) but other than that it outperforms the M4 and if the 830 is any indicator, it should be very reliable too. I did read that TLC nand does not last as long as MLC and that a 500GB should last around 10-13 years compared to 21 of MLC but I dont plan on owning anything that long. I mean I changed hard drives 4x in 18 months, so Im not too worried about that. I so far give this drive a 9/10... and believe TLC will end up being the new and affordable SSD for the average consumer.