Have a mid-2010 macbook pro and I installed a vertex 2 like 3 years ago. It's still running fine somehow but I don't want to risk losing my data. Am I paranoid or should I get a new ssd? preferably one that is sata 2 since that's the limit of this chipset.
Why not doing regular backups in a cheap external HDD? When your Vertex 2 definitely fail there will be even more reliable SSDs...
OMG just make a backup. How can you worry about your data and not have a backup? That is just stupid, sorry... I don't know if they still make SATA 2 only SSDs. But any SATA 3 SSD should do fine, and you can still benefit from it later if you change your machine (though this is less likely now with all the new Macs having blade SSDs).