You never know till you try

You can pretty much pug/df the first 4, get some nice lil drops from them. T5 I'd personally reccomend a group of friends, a lot of discussion about how you're going to do it. For the sake of the "oh wow" factor, i preferred to go into these fights first time not knowing what was coming, but once i got a butt-whuppin i went and did a bit of research on it xD