Ahmad Toutounji wroteOk thanks guys, but what about the price? Is it overpriced according to other top ssds?
Depends what price you have!
When I did my research the bigger SSDs (512GB, etc.) were more performant than the smaller one. But I couldn't afford nor did I really need a big SSD. The 850 pro 128 was the only smaller one I found which had performance very close to the bigger models, which is the main reason why I bought it, and the price was affordable.
I think that Samsung SSDs in general have good value, especially the 840 models, if I remember well.
I also think that they have a good reputation in general. But bear in mind that if you want to take full advantage and have the performance you see in benchmarks on the internet you need recent hardware (not like cutting edge, but recent). My latptop is years old.