What are you listening to? I'm streaming it from the BandCamp page, and it's not particularly bad. It's a bit bright, but...Yamaha NS10 bright, not brickwall distortion bright. And yes, fatiguing, but not the worst I've heard (the worst I've heard is The Cross' Justice). I even ran it through Audacity (using SoundFlower) to analyze it, and it doesn't look particularly heinous:
Yes, I means GoGo Penguin.
E.S.T. I think they "created" a specific subgenre of Jazz, something between pure improvisation and a well-studied sound. In the same style you can listen to Tingvall Trio (others that should have been the new E.S.T), Avishai Cohen Trio, Helge Lien Trio ...
Right now I am listening to one of my latest acquisitions. Tord Gustavsen Trio "The Other Side"
Edit: I'm not sure why the links in the images do not work