Hey! I'm using samsung 850 evo m.2 250GB and aliexpress 9$ adapter for my MBA 13' 2011. My ssd is writing 530+mbs and reading 500+mbs now instead of 150 and 200mbs with native one. And yes, 6 years ais a big age for ssd, but still. Now all the websites, video, even the hardest ones are playing and loading instantly!