Crucial's move to give the "MX" branding to the MX300 slightly tarnishes the reputation of the MX Series in my opinion. You can usually count on "MX" to stand for the highest possible performance, whereas "BX" stands for budget.
Excellent price/performance; Excellent price-per-GB; 3 year warranty; 7 mm thin-ultrabook compatible; Acronis TrueImage HD included
TLC not trusted by as many users as MLC; Only average performance