At this point in time, any SSD you can buy for less than $0.50/GB is a solid deal.
As it's used, give it a proper SATA Secure Erase. This is not the same as a format done with Disk Utility. The process is easiest if you can connect it to a Windows machine and use Samsung's software. You can do it on a Mac, but it's more complicated. Guides are available through an online search.
A SATA Secure Erase resets all the flash cells to their default state, so the drive will perform as-new when you're ready to reinstall OS X.