Guys, I wanna say dont get too stressed up over sequential transfer rates. Most of the time, it doesnt matter. Why? Most of us have only 1 SSD. If you transfer from SSD to HDD and vice versa, the bottleneck is in the HDD. If you transfer within the SSD, you won't get full speed as well. Loading files into RAM hardly allows the SSD to hit full speed (unless you have lots of RAM and transfer huge files into RAM).
So, most of the time, you can only see the results during benchmarks. Not in real world.
Even if you have 2 SSDs, unless you enjoy copying large files between them, you will hardly notice any difference.