After a little research, you’ll find that some variations have been played by chess grandmasters, but way less frequently than more solid alternatives. This often means they are used as “a surprise weapon,” and there’s a good chance there’s something about them that doesn’t hold up too well against correct play. Oftentimes, there’s just a single variation that comes close to refuting the idea, and the opponent has to know that line or find it over the board. Otherwise, the adventurous player often gets a good game.
Emanuel Lasker vs Frank Marshall, St Petersburg, 1914. Play, solve and comment