Kaiten-sushi is rare in these parts. I've never understood why, either, as it's absolutely EVERYWHERE in London. Even the local branch of London fave Itsu is doing their sushi the old-fashioned way.
The one on 45th (Raku, I think) isn't terrible. Never tried the one on 27th Street though.
I suspect that part of the reason kaiten-sushi isn't taking off here is because "omakase" has taken on lots of status connotations (it's the new truffle), and it's hard to do omakase meals with a conveyor belt.
A while back, I went to a sushi restaurant in Teaneck, NJ- it had been run under a name I don't remember, but it was quite good and frequented by a significant number of Japanese diners. When I returned, it was taken over and is now called East- and they had the "train" style of sushi served at a large circular bar- you take what you want and pay according to the plate- like doing dim sum. Anyway, they appeared to be part of a chain, or affiliation of restaurants- not all called "East"- but they were part of a group that at the time- a couple of years ago- included a number of NYC places. Might try to contact them in NJ- 201-837-1260 and see if they are affiliated with any other places in NY that do that style. I remember it being popular in Nihonmachi- the Japantown of San Francisco.