Yes, that model is 1st gen. The advertised 560/430 Read/Write speeds are good but those are for large sequential files which people don't deal with the majority of the time they are using their system.
What makes the Vertex 4 shine is its low access times (latency). Most SSDs have access times of .10ms. The Vertex 4 has access times from .04ms to .02ms.
So you will definitely notice a difference with Windows startup, shutdown, and running programs in general.