Briefly using the EVO SSD, boot time was phenomenal. With the Velocirapter, less so.
However, near the capacity of the 500GB OEM unit, the scrolling became slow - especially on covers.
Putting the new HDD in with the SSD hybrid drive makes it all fluid. 95% of SSD as a "quick and dirty" measure but hassle free over that of the EVO SSD.
I found recovering the disk of first boot also helped get over an unspecified start-up error. No problems since.