...Is far too easy, please make it harder.
Not that I want to say it is a bad instance or whatever, I like it, but it takes too much time (because you have to wait so long) and therefore takes longer than normal Inferno Missions (seems to take forever here), and on the other hand, it is not really difficult to do it.
We were running it on easy 220 Adv/Enf and could do it while we were semi afk...
Now I logged Doc and we invite some "lowbies" from our Org to test the Hard difficulty, and what should I say... it is too easy in terms of concentration or however i should say it, the Tank doesn´t need Improved Esse, I can semi afk teh interwebz.
So after all I can just say, it is kinda boring and no real challenge, except that it is time consuming and therefore even not really to be considered a good alternative for regular missions.
So I would suggest, spawn less monsters, but harder ones, and more at a time so that it is a real challenge but can be finished faster than regular missions so you get the same xp/hour amount in the end.
Also maybe I would change the Hard difficulty for something like an endless mode, that starts with QL220 mobs, then 230, 240.... and so on and each time after 10 mobs or so a mid-boss spawns who gives a smaller daily-xp reward or something.