that was because all the graphs and reviews had shown that the 840 pro was in almost every scenario one of (if not the) fastest drive.. i now see that it's wasted moneyBut the 840 Evo and MX100 250GB are literally CHEAPER than the 840 Pro 120GB.
You'd rather spend more money on less SSD because you don't want to have extra storage left in case you want to put anything else on the SSD in the future?