I had been complaining about X6 being slower than X5. However due to a computer crash, I took the oppertunity to put my C: onto a SSD 256Gb drive.
It has increased my windows experience from 5.9 to 7.4, this is a 2-1/2 year old system. But the good news is it has significantly increased the speed of X6.
I still have my files on a std drive, so initial acess is still slow, but if I can work on a particular file for a period of time the speed increase is really noticable.
A $250 investment that has probably increased the life of this computer another year. I would normally upgrade about every 2 years.