Pros: Clear and distinct sound, very present bass. Great build quality. Great travel box. Lots of extra earplugs. Detachable cables. Very comfortable fit.
Cons: Thin cable tangles easily if you don't store them in the travel case. Price is a bit high in my region, 385$.
This is my first review, so bear with me... Sennheiser IE8i, are the first IE headphones I've bought that costed more than 85$. I've always been a big fan of great sound and currently own Bose OE Triports, Bose 3-2-1 GSII and used to have Bose in my car as well.
The IE8i were somewhat of a huge disappointment at first. They didn't sound anything like I expected and lacked that heavy flowing bass I was use to. The fit wasn't any good and I was seriously considering returning the headphones, claiming they were defect. I tried my brother in law's new Shure SE215 and was blown away by the amazing and comfortable fit, and the great sound. The bass was punchy and present, and the sound so good that I just wanted to turn up the volym more and more...
I soon discovered that he used foam plugs, and that he really recommended them because of the great fit. I switched my rubber plugs to foam ones instead, and my headphones really transformed. They were no longer sensitive to how they were fitted into my ear, and the sound went from being dull and unimpressive to amazingly fantastic!
The sound is clear, instruments feel seperated wich is fantastic, and the bass is evenly balansed with a good kick and good sub bass. The tuning function is more likely to be of use to singers, if they use them as moniters, but for us mortal users... just crank the damn thing up as far as it will go.
Now after playing them in, my Sennheiser IE8i are without doubt the best sound I've ever heard in an IE headphone, and I strongly recommend them for you who aren’t sensitive to price. Although the sound is very clear, it does tend to get a bit uncomfortable at really high volumes.