I saw this film at the Toronto International Film Festival, and it was the most memorable film of the fest--more so than other great films screening like Capote or Brokeback Mountain and for sure, your run of the mill, Hollywood films like Elizabethtown, In her Shoes, Walk the Line, etc. Wayward Cloud is a daring film about love, sex and isolation, and it's set in an almost apocolyptic time when watermelon has become the source of water, food and fetish! The film is amazingly original.
Definitely, the "real time" shots which are often utilized in Taiwanese film, can try your patience, but indeed there is a "zone" for Tsai Ming Liang's films and once you get there, all the images are mesmerizing--watching a woman walk up a flight of stairs, etc. And the sex scenes (which are plenty b/c the film deals with porn) further highlights our voyeuristic "mesmerization" reflected in the style of the film.
Short of writing a spoiler, please please see this film (if it is distributed in your area)...the last shot is the most disgusting and most beautiful thing ever...you'll have to see for yourself.