it will replace a faulty hdd
already have a mx500 in my main
compare to any dramless ssd
smaller usable capacities are because of the pre allocated spaces such as OP. In some sense your assessment makes sense, if the reason is due to inferior controller scheme that needs more OP space to keep up the warranty TBW and speed competition. But some datacenter SSD's offer 480/960/1920 drives and offer twice the TBW numbers than consumer grade SSDs.Personally I'd avoid SSD's with capacities such as 120, 240, 480 and 960 since they tend to be ones with crippled spec's just to meet a price point for extremely budgeted folks. In retrospect they seem fast at first go but as you work with it over time, they seem to go as slow as a USB2.0 drive. What sort of SSD's do you have access to? As a side note, you're looking for 2.5" drives?