Long story behind, even checked SuperSSpeed and Intel DC S3700 Budget has changed, so these are the choices now. (unless i get the DC for 100€ less somewher lol) It's quite a clusterfucked marke, bad firmwares, no updates, I just can't find a perfect drive balanced for my needs, since i'm definitely not doing server-load I do not want the enterprise ones for that, I want it simply for data corruption protection specifically the lower error rates and better firmware to eliminate any BSODs or such unacceptable sacrifices. I do not want peak spead I do like IO consistency and stability. At first it was Samsung 840 PRO 128GB but I am impressed with Intel's offerings in terms of reliability. However SO MUCH COUNTER-INFO is on the web, I am in a hurry as the SSD is the last thing on my build and all other stuff is already ordered en-route, so I spent quite some hours, at first only good news, then I couldn't research intel firmware's because of their FIRMWARE UPDATE TOOL , i cannot see how many updates there is and how good they are releasing them in regular timely fashion (or is the intial release THAT good?) There's also those AHCI-detection issues plaguign a lot of drives (at least soem people, there's always somebody) but the challenge is to filter through those who are noob-comments and those who are pro. I really don't want failing this because it's an OS drive. I need some reassurance. Also i don't care about capacity but it should be 100GB or above at least, not above 180GB (too expensive) In a summary, I know 335 is newer but has 20nm which may be less reliable because it's smaller, at least some reviewers had problems of low life or at least a pre-release firmware bug, still more comments was on this having lower than 3000 PE cycles. The 520 is older but for some reason may be reported at faster speeds or atleast that's what I heard, the 330 should be well, I forgot half the stuff thorught this day but I should recall it as you guys mention it. I know the DC s3700 doesn't even need TRIM because it's properly build to avoid that, TRIM is actually a workaround patch for the consumer drives, interesting, yes i watched the intel QA about it in full. I've looked a lot into Samsung 840 PRO and performance great ofcourse, but I did found no any proof about good reliability, and seeing there's zero FW updates, makes me cringe. On top of that none of these drives provide power-loss emergency capacitors so.... I am not planning to reinstall my win7 in less than 2 years, and the most terrible thing to happen is that the SSD causes BSODs or freezes, the other PC i helped build has Crucial M4, well there is no problem with it, it's like 9month old but in the last month i heard there were 3 BSODs, not sure if RAM related, probably not cause it would be a different pattern imo. I'll have a lot more budget some time from now but right now just not, and SSD shound't be the thing to save on I know, atleast if I can try copying SSD install to another SSD would be better than HDD from SSD right ? EDIT: Crucial M500 looks like it won't come in this 2 weeks, Q1 is almost over, no reviews yet either. M4 has good firmware updating, but perofrmance reviews seems to be lower.