Anybody had experience with stealth Indra ?

Mert, take a look at my review of the Stealth Metacarbons , I also have a pair of Indra's in my system, and run Pass Labs XA-100's so the details hopefully will helpful to you.

and is it better than Valhalla?

I have a pair of them on loan from my local dealer and I am very impressed. I have compared them to my standard Nordost Tyr and they are very smooth and musical indeed. I am using them between the Boulder phono and preamp. The interconnects from the preamp to the power amp are Valkyrja as are the speaker cables. I have set the system up to allow me to switch the inputs to the preamp between the 2 outputs of the phono so instant switching is possible with no other influences such as level matching. Both of the cables sound very good, the Stealth just a bit rounder without any loss of detail or extension. This is something I am very sensitive to and other than the extreme cost of the Indras, I see nothing but upside over the Nordost cables.

>>and is it better than Valhalla?<<

A yes or no answer must be tempered with the user's definition of "better".

One man's ceiling is another man's floor.

It didn't match with trasparents ref mm speaker cable and Acrolink A7N-2070 IMO.(valhalla was between Accuphase dp-78 and Boulder 810)If I had a non networked spe.cab. like Stealth Dream or even Valhalla spe.cab. , result could be more positive.