So I went for this as it was a little more than a couple of other SSD's but it had 512gb. However once installed before loading any operating system it had 477gb! Bit gutted to be honest. Also if replacing a bigger HDD with a smaller SSD its a bit more involved depending on number of partitions on your current drive. A like for like sized drive will be alot easier to clone. Anyway does everything else as expected with the main requirement being start up time reduced by 4x. Battery life of the laptop also extended and runs quieter. SSD (whatever you choose) highly recommended.