What I like about the Japanese take on tickling is the strong integration of tickling and sex together; I'd LOVE to tickle torture a hot girl and get a blowjob at the same time, BUT beggars can't be choosers. Also, the female models in Japan seem to be a little more willing to participate in the ongoings than a large number of American models who are putting on a performance...seasoned LERs often notice this by the type of laughter they give off.
The NEGATIVE aspect of the Japanese tickling is what I feel to be the lack of sophistication and expertise the LERS seem to exhibit. With the exception of 1 professional LER (who wears sunglasses and an occasional bandanna), they all seem to scramble their fingers over the girls without any real effort of tickling them. I've watched many clips and wondered if the girls are really ticklish and are being tickled JUST ENOUGH or whether they are faking it...given that I don't know Japanese and am not familiar with the vocal patterns of the language, I can't say if this is well-founded.
You take most actual tickling producers in the U.S. (TIB, MTP Jeff, Yaqi)...they're SERIOUS about it; they develop techniques, attack patterns and really make an effort to find and exploit the most sensitive parts of the body. I've wondered what would happen if the Japanese girls were subjected to the talents of the American LERS...I assume the reactions would be very different if they aren't used to be tickled by experts.
As far as the crying goes, I dunno what the hell that is. I notice it in the adult movies as well, where the girls sound like they're in pain rather than pleasure. TICKLING agony is one thing, but sexual agony is another, and in the Japanese videos they both seem to be unpleasant.
On top of that though, I'd hesitate to say American producers have the no-sex-please-we're-puritans stance. Sex & tickling is a great thing, but it's not the ONLY thing; some people aren't into it, so that's why we have variety here (AND Frenchtickling.com as well). But even though the Japanese come up with some of the most crazy sexual stuff in porn, they STILL, for some COMPLETELY INEXPLICABLE AND UNDEFENDABLE REASON, put mosaics on the genitals of the models...at least in the U.S., the fake videos let you see the details.
Maybe HisDivineShadow or Krokus can give us a better idea about the "agony" and the mosaics. Fellas?