I hopped on Duolingo for a way to brush up on Spanish but all the questions are easy. I'm told i can just keep skipping ahead beyond where it puts you automatically, but I took their level assessment quiz to place me and I got no questions wrong at all.

I think they might be good for "I know three sentences of XYZ language or less, and want to be able to read a newspaper article" or something, but I don't know how much the format can help someone whose level is at "I can pretty much hold a conversation with a native speaker, if they're patient and understanding."