Rocoo will have hiss on most of the CIEMs, with SE5, it should be ok, but still there will be a small amount of hiss. Rocoo BA is designed for BA CIEMs, so there should be no hiss. With SE5, there is no hiss, with 1+2 or JH13 I can still hear very little hiss, which is fine to ignore.
Pairs really good;) The treble is a little bit on the brighter side. But I think I got used to it;)
I have to agree Rocoo BA is black pretty much on the SE5 and Flat 4 Sui. On the 1Plus2 there is a very slight hiss but you will not hear this hiss on quiet passages in songs or when music is playing at all so it is a non-issue. It's something you will have to really listen for and making an issue over something that you have to strain to hear is just looking for trouble ;). On the 3rd ANV there is some slight hiss on the SE5. Pretty much a non-issue as well as it is relatively low. But the BA is black as tupac said. If I do longer sessions I tend to turn the volume down to around 12 and that gives me comfortable volume listening with all the detail. On songs that are more dynamic I'll turn it up to 14 or a bit higher.