The reviews are uniformly bad. Should make you think twice before considering working for them.
In an interesting and related recent development, “Public schools here [Kashiwa, Chiba] have been unable to start their native speaker-taught English classes this school year after the city’s board of education was accused of violating labor laws with foreign language teachers.”. Basically ALTs employed by the Kashiwa Board of Education were being taken advantage of and screwed over. The details are in the Lets Japan post.
The Lets Japan post has a link to a compilation that lists how ALTs are getting scammed or screwed by dispatch companies. This ALT scam compilation doesn’t mention names but we will Interac Japan is one of the biggest and most notorious companies.
For an example of what Interac employees are like follow this link. The Interac stooge who says his name is Roger Starkey firstname.lastname@example.org hid the fact they worked for Interac while trying to defend Gaijinpot a site which suckers fresh meat foreigners in to working for trashy companies like Interac Japan.