Have any one heard about xxsim ?

I ve recently made an urgent visit to japan,it was hard to find a international calling sim provider.My It manager suggested me xxsim.Have u all heard about it ,it offers a good deal?

I took a look at their website. They have an extremely high up front cost (and its unclear if that comes with any credit) coupled with moderately priced calling rates and extremely expensive data rates (despite being at slow 3g speeds).

There are probably only a few edge cases where this sim makes sense, and most people are probably better off getting an unlimited data sim from b-mobile or econnect instead and using a voip/internet phone service to do their calling.