IPTV has been around commercially for years. Recently, the codec have got better, so the bandwidth usage has dropped to the point where it's now viable to do what is being advertised.
There are similar boxes from most of the media streaming companies, and I've often thought about plugging one into the MIL's TV back in the UK and streaming it to mine here.
However, check what kind of b/w they do use - most tariffs here are still limited or expensive or both, and streaming media will still use a chunk if you want half decent quality.
Other thing to check is whether the DSL connection at both ends (Though I suspect Japan will be fine) is up to it. If you're on a cheap, slow service, you risk getting stuttering video unless the box downloads it all and then streams form a disk like TiVO in the US and the HDD recorders here.
See if the rented option has a trial period - then, even if you liek it, you can cancel and buy outright once you know it works, if that's your preferred option.
Jeff
1994 300TDi Defender
2010 TDV8 RRS
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