The presence one is actually accessible. I had the same issue with the willpower one in Alderaan. The Alderaan is obtainable by getting yourself killed at the doorway, you can spawn on the other side and through that way actually get it. The presence one in Correllia took me ages but what I ended up doing is a mate who COULD get through it and below the ramp dual me, where I jumped off the platform with the big sattelites attached to it and he pulled me in with his grapple kinda ability.. Its kinda hard to do but its possible

Anyone a clue about this yet?

I used Qyzen for a long period, but I got really annoyed of his AOE ability that breaks stealth, also on several AOE Mobs he just couldn't handle the aggro compared to my DPS so I switched to Tharan. You have to get used to him, but once you gear him properly he heals like a train and you should be able to easily clear PvE fields. Use your stuns A LOT on elites and don't forget to interrupt them, it tends to help

I´ve seen of them on the AH, level 47 is required to wear them.

Had exactly the same question in mind! In line with the subject; are there other abilities which could be considered redundant? Which should I use constantly and truely not forget about, and which ones should I definitly leave aside or use only on that one special occasion?