I know I am kinda late here, but I have a W530 with 24GB RAM + 1TB SATA SSD, a 128GB MSATA SSD, and a 2TB HDD in place of the optical drive. I bought mine new, because I hate the MacBook Pro's lack of durability, (that's the computer that was recommended to me) and the ThinkPad keyboards are the best in the class. My W530 is used daily for video editing, light gaming, photo editing, and audio production, and it is quiet, powerful, and fast. An SSD really makes a huge difference!
All in all, I think the W530 is one of the best laptops to buy used if you are looking for a workstation. I am typing this up on my actual W530, while exporting a video and streaming Spotify to my Bluetooth speakers. Best investment I have ever made!
Happy buying!