The emu support is the same as the Wii, when it comes to running the Wii channel. As for emu on the WiiU side, it does a few more like DS. No online service needed.
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Only thing is you're very unlikely to find a Wii U for around $30. Well maybe you can but it'd be blod and probably won't have a controller pad, cords or anything beyond the non-functional console itself.
Wii U new prices are ridiculous over here now.
I've only looked on ebay but new is around $500au...all I can see atm are premium bundles though like MK8, Xenoblade Chronicles X etc. Impossible to find any irl shops with new stock now.
Used prices vary a lot but I'm wary of spending decent money on any used console, ones that have screens in particular.
There are some dirt cheap used consoles but those are faulty.
Well technically consumer law here gives us power beyond manufacturer warranties in many cases...but if something is like 4 years or whatever old, arrives in gwo and then dies some weeks or months later not much can be done afaik. It does offer protection against doa though, even with used purchases (although obviously if it has been explicitly stated that something is faulty and sold "as is" you haven't got any recourse).
Stuff basically has to be fit for purpose.
Basically, yes. You can't scam people by selling faulty products as fully working.
Of course it doesn't cover damage during transit that's another matter.
It gets more interesting when the ACCC harasses the likes of Apple over crap factory warranties :wacko:
I posted a link about that recently.