I was reconditioning a 15" 2011 MacBook Pro that had been left behind by a deceased relative of my friend. My intent was to soup it up and donate it to a needy person. I replaced the two 2GB RAM sticks with two 4GB ones that I had removed from my spouse's 2012 MacBook Pro when I had upgraded that one. I also ordered a replacement battery from Amazon and installed that. But, the computer remained discouragingly slow. So, I purchased this internal SSD from Amazon, largely based on reviews on the site, and of course, reasonably low cost. I also used an ineo 2.5" USB 3.0 Tool-Less External Hard Drive Enclosure for 2.5 inch 9.5mm & 7mm SATA HDD SSD with UASP Supported and Screwless - Grey [T2573G] from Amazon to clone the internal HD to the SSD before installing it. My objective was to deliver a workable computer for every day and student use and not for high-powered uses like gaming. The ADATA SATA SSD did the job; the computer was a lot zippier. More than that, I cannot say, because the MacBook is now in somebody else's hands. However, for the price and capacity, it was a good purchase.