I have heard the Jewel, Odin and Obravo ra 21. They all offer something unique to the table. The Odin I ruled out since I had the Black Erlkonig. I felt it was in their area, detailed imaging and technically brilliant. I found the Odin too sharp and bright for me personally. The Jewel makes one feel as though they are the singer standing right on the stage with the orchestra. You can hear all the instruments around you 360. It's good at handling the volume with low distortion even when blasted to a high volume.
There are a lot of people who likes this but personally for me I prefer to be off the stage sitting in front of the music as the audience. I like the spatial feel and to be slightly away from the music. The Obravo ra 21 CU I really like and I think it only works with the LP6. The sound paired with the LP is right up my alley but the price is beyond what I want to pay for an open back IEM. The newer 21 version's quality is really up there though and I cannot knock it. Just I cannot afford it or prefer to buy an Over the ear headphone. Because with the Obravo it's open back so to listen to it in the streets is really money down the drain. You need to be in a quiet place to listen to it.
Anyway, currently running in my LP6 Platinum. Loving it at the moment.