LOL. These are perfectly fine SATA6G SSDs. They blow away a Vertex2 or the like.
Sure, even more modern drives are faster, but that doesn't mean that these aren't fast too. It's basically splitting hairs once you get to this performance level. Nearly any SSD is far faster than a HDD. (Except for a select few first-gen consumer SSDs.)
SSDs are basically bumping up against the practical speed limits of the SATA3 (6Gbits/s per drive) interface, and have been for some time. It's still extremely fast.
If you want a bigger speed bump, it's easy enough to buy them in pairs and run RAID-0, which on many motherboards, can effectively double your speed (Newer intel motherboards have taken this into account and can get just beyond triple speed with a 4-drive RAID-0 array). Even older boards can reach 1GBytes/s on a two-drive array.
Will you notice the speed difference? Not as much as the simple jump from platter HDD to single SSD, but it will benchmark and boot even faster. In other words, a single SSD is fine for most people, except those obsessed with squeezing out every last bit of speed from their system.