If you're getting it free or real cheap, nah wouldn't hurt.
The SSD will be a huge improvement over the HDD. Due to the bus limitations (assuming you meant 840pro which is SATA3) you won't notice a huge difference right off the bat, but to some that difference is subjective.
If you want to see the difference between a HDD and slower SSD than yours, here is a good way to see it.
"Resolution is just a number." #Ubisoft Origin/Steam
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