Maybe I'm just an old head, but it sounds average to me. How old are they, why they sound like their voice hasn't hit puberty yet, both got them high pitched voices. Personally, the best songs were the ones with features. Both they voices are too similar to work together as a group. All the great hip hop groups balance each other out. Outkast, UGK, 8Ball & MJG, etc.
First disc was forgettable to me. Swae's album was solid, but it is just some soft harmonizing. People criticize Post Malone, but this shyt ain't all that much different. Still gotta get to the third tape, but it definitely slapped.
I ain't saying it is bad, but just solid. As a group, they just don't work all that great together.