has anyone used this website for booking japanese hotels?? are they legit? they're prices are so ridiculously low....i'm scared to use the site.

I think the site is legit - but the prices they advertise on the front page are not real - I bet they are the lowest rate possible for a SINGLE room.
Go ahead and select you dates and you get a price, they are about the same as www.asiahotels.com (which is what I used)

These rates don't seem RIDICULOUSLY low. Or I would say they are just normal to slightly dicounted prices. For example, Sun Route and Tokyu Inn are chain "business" hotels and a single room will typically be very small with a tiny bathroom. I myself would be alright with it considering the price.

I said "..normal to slightly dicounted prices.."

I meant normal to slightly dicounted <b>WINTER</b> prices. This site offers the lowest rates often from 01.Nov for two or 3 months in winter.

I dont think they are low.
I paid 18400 y at The Mansions at Roppongi in Tokyo and
Y 17500 at the Westin Miyako kyoto in Kyoto