I've ridden in the US a bit, in NYC, LA, Florida and a few other places, and generally I find it no worse than UK - and in NYC's case, a lot better than most UK cities I've ridden in! Road surfaces excepted. Florida is a bit different in that there are few back roads, and drivers are just not used to seeing cyclists.
I have to admit to wondering how Kurt's going to progress as the summer comes on. Steve's schedule, like Tommy's, allows for the crap weather and low temperatures of the UK winter, then picks up to, what, 250-300 miles a day by August? Kurt is enjoying now almost the best conditions he'll get through the year, assuming he stays in the USA. I understand they have to ride themselves into the kind of form that can accept 250+ mile days, day after day, but the summer in Florida - and much of the USA - is not conducive to the efforts involved. When Steve is likely to have great riding weather - and the roads to exploit that weather - Kurt will be looking at 35C, serious storms every afternoon, and millions of tourists on the roads. I can see why Kurt wants to get the miles in now, but is he doing enough?