I received my IE80. I already have a pair of Shure SE535. I bought the IE80 to have bass and maximum soundstage.
The first thing I noticed is the random inclusion of tips. I was shocked to find out they are not delivered in pairs. The thick olive tip only has one icluded. Another layered tip only has one. And a third one also is missing it's other tip.
I began testing the IE80. The soundstage is quite good. It is wide, as promised. The mids are weak. The worst thing is that there is no bass whatsoever. The claim that Sennheiser IEMs'are "bassheads" does not apply to this one. It might be sub-bass, but (with all do respect) that's just a name for me and I simply do not hear a strong and punchy bass at all. It sounds extremely light and treble. I tried different types of music, both detailed and very bass-heavy music. There simply was no bass at all. I did the bass-tuning. There is a slight difference, but it's extremely overrated. They might as well turn the bass all to the max by default. It would still not suffice for it's task.
I A/B tested the IE80 with the SE535. The SE535 annihilates the IE80 in all departments, except soundstage. Even though the SE535 is known for it's lack of bass, on a good setup, I do not experience more bass coming out of the IE80. It's just not there.
I am very disappointed and will return or sell the IE80 IEM. I expected so much from the IE80. I'll stick with my SE535 for now. For anyone who wants to have an affordable IEM with good soundstage, this might be a good choice. But if you need bass or decent mids, spend your money on another product.