That is the first "cut in" pannier system I have seen (apart from Honda plastic ones I have). That underbox looks like it would make a great toolkit holder also. Never heard of this crowd before, some realy nice gear.
The africanqueens website looks promising. I like their panniers and their crash bars look good as well. As Rusty mentioned, globescout has some awesome panniers as well, but they are only one size - 45L. Anyone purchased from africaqueens and had shipped to the US?