I saw them once in the south american tour, at the very beggining of the ATS world tour.
The requiem was absolutely cool, it really fits for an epic start of a show, people went nuts screaming since it was the first time the band played here, like, ever. i think it really flowed well to mario savio's speech and then wretches & kings.
The radiance really shines live, I like it a lot more than studio version. the piano and the additional "the catalyst" lyrics with vocoder really set a mood. it was refreshing after having a plain piano intro for like 3 years, with no changes whatsoever. the people was really quiet on this one.
Empty Spaces didn't had an impact at all. maybe it just makes when they come for me blends better with the show. but as everyone said, it's barely time consuming. after all the few times WTCFM was played in LT world tour, still had empty spaces
Jornada del muerto it's a good track for making a transition between the first third of the show to the second one (wich had the slower songs in both mtm and ats tours), unfortunately the first few times that the band played it it really didn't sound well. in particular, mike had problems on his mic during the show so it was just chester when I saw it and wasn't good. other shows had better performances of it.
Wisdom, Justice and Love its weird. at first i didn't liked it, but it growed on me. it's another songs that makes the show flow better (even tough it's an energy killer) but it really represented what LP wanted for the ATS tour. chester standing solemny hearing the speech it's just... this shit is serious.
I didn't really mind about Fallout, neither most of the people did. I was happy to see some lyrics of Burning in the skies live tough, since it wasnt played until australia. it works as an opening for the catalyst, but not as an show opener like when it was used on london.
I hope this gives you some idea about it.