You can upgrade the ram in those and storage with a M.2 but levono made it unnecessarily difficult to do unlike the older models. Caveat emptor but if you can find a cheap one go for it. Just depends on what you’re going to use it for.

I was trying to grab a W520 for dirt cheap but got sniped. If you are ok with a desktop they sell old business SFF towers for less than $80 all day long and easy to upgrade with used parts off eBay.