I've been holding onto NIO for awhile now and it's treated me nicely so far. However there's a couple of things I am skeptical about.
The risk of inspection being one of the primary ones, this could cause NIO and various other Chinese based companies to just entirely vanish, it's a risk I am personally willing to take, but it's not the same as tesla and in all honesty, TESLA is a giant bubble as is. So following something that basically is trailing off the trend of Tesla could be a danger to someone who's got minimal funds / less knowledge of investing.
For me, my personal take is invest it, hold it awhile, any bad news, get out as soon as possible. This is not a stock I feel safe holding super long term.