Hi, I am going to buy a second hand mac book pro which comes with: -high-res anti glare screen -core i5 2.53 ghz scree. -128gb SSD I asked the seller and he said that it is the stock SSD. I do not know what is the SSD model and I am wondering whether the stock SSD worth the extra money I am paying or not. I will mostly use the laptop for programming and I am thinking whether I will see any performance improvement or not. Thanks.