He has come up with a great concept for switching the whole setup around using midi program changes. One of the good things about midi is this sort of thing can be done so well and easily. Interesting how he uses his small iPads to switch main stage as well. Also I like the way he has set up fail safe systems too in such a precarious live situation.
I am a little disappointed he did not talk about the actual synths themselves a bit more and what they were being used for. I see he has no less than two Kurzweils delivering probably the bulk of his sound and rightly so as they do sound amazing and sound quality from Kurzweil is up there among the best. Also he use two Muse Receptors set up the same in a rack. One acting as a backup to the other. I am sure he has got the Receptors producing quite a lot of sound too. SSD drives sounds like the go if you are loading large sound banks etc..
Separate organ is always a good thing too as you can get those sounds very real and rich from a dedicated instrument like that.
Looks like he has also got a Roland Fantom G6 behind him the other iPad is sitting on. That would be smaller and lightweight but still very powerful synth engine wise being controlled remotely from his Kurzweil.
He would be better off using the latest Kurzweil PC3K as it has serious controller functions and could easily replace both of his current two Kurzweils. Sound wise it is over the top and can store upwards of 6000 patches and all without the need to load anything. A lot of guys like the older K2600 too as it had a rather nice keyboard action. So does the new one too.