What bucha is to regular Kombucha (think GT's Synergy); I think Marley Yerba Mate is to Guayaki's Yerba Mate.
It's a lighter, more mainstream Yerba Mate.
Lots of the comments were "it tastes like unsweetened tea". I concur. It does taste like tea. Does seem to have some euphoric effect. I noted it but was kind of expecting it (euphoria of chocolate). Another office mate had half a can and said the same as well. Only drank the Be Jammin Berry and the Jamaican Me Mango thus far so small sample on that attribute (euphoria of chocolate).
Overall, I think this will appeal to Yerba fans but not hardcore Yerba fans. I think it will appeal most to those that like unsweetened tea, too.