I have an Apple White Silicone, (8Plus version) case for my iPhone 8 plus and my brother uses a midnight blue (7plus) silicone case on his 8 plus...the biggest difference is the grip. The confound which apple is using for the 8plus model, is more grippy and feels lightweight in hand in comparison to the 7Plus version of the silicone cases.
Coming to the shortcomings, just like all silicone cases, the coating starts coming off the edges in just a few days. Literally like a fortnight, that too after very careful sausage. The yellowing of the case is common too but not as much as the 7Plus version of the case. It grippy, the buttons are clickable and not at all bulky. Slides in and out of pockets and looks distinctly apple BUT, the yellowing and coating wear off are major issues. Good case to have but certainly not for $55 that i paid for it in India.