I would not be afraid of buying a Chinese box, though there are makes I would avoid. (Golden Cup springs to mind)
Using 120 Bass boxes as standard, it is possible to buy a new Chanson 120/41 or Pearl River 120/41 for under £1,000 in the UK. Compare that with the cheaper end of Italian 120/41's, which retail in the UK for around £2,200, and there is a compelling argument for at least considering a Chinese box.
Though I have no current plan to buy one, I may in the future consider a Pearl River. My Chanson is used almost every day, and absolutely nothing has gone wrong with it yet.
When played on its own, my Chanson sounds lovely. A good friend of mine owns a Bugari and a Hohner and, when I play duets with him, I recognise that there is a difference in sound quality. I console myself with the knowledge that he has paid many thousands of pounds more for his instruments than I have for mine.
The main consideration (apart from cost, that is) is what you intend to do with the instrument. If you expect a booking at the Royal Albert Hall, you may not want to use a Chinese instrument. On the other hand, if you play around Folk Clubs, for instance, a Chinese box would be fine & dandy.