At least one happy customer
Can't comment on the IP issues, but if Xiaomi can work to keep away from both bricks and mortar retailing, and the poor value that mobile networks often offer, they may have a good business model.
I'm using a grey import Xiaomi, and it's a superb phone. If they Xiaomi worked with some of the (currently) grey importers, and avoided all the oncosts, and vast waste of typical European marketing, they could build a European brand based purely on product quality and value, I reckon.
So although the IPO may not create value (they never do) all I can say is that I've already bought two Xiaomi phones, and they'd be at the top of my list for the next few purchases. If they launch an official EU presence, extensive marketing, EU head office, official service centres and the rest, then I'd actually be LESS likely to buy one, because that all becomes vast expense they need to add to the price tag.