Saw them on Friday night and their singer said he was sick with pneumonia too. But I couldn't tell, he has more energy and sounds better with pneumonia than I ever could healthy.
I saw them on Friday too. It was awesome and I would've never known Jason was sick unless he said something. I do kind of wonder why he doesn't climb on things, go off stage, etc as much as he used too. The first two times I saw them he was absolutely nuts (in the best way) running all around the venue etc. he hasn't done that at the past two shows.
Either way I'm pumped to see them again in April! The best live band out there.