But answering as a hypthetical roomba owner: As I am from the EU, this new ownership would actually be better for me. The US already mandates spying with devices like these, and has been caught multiple times doing so already. It is also known to share info with the domestic services, the latter point not being true for China.
China absolutely shares info with all of its national police services, intelligence services, and military. Depending on the company these PLA may literally own some / most / all of the organization.
I am not in the US or China, and on balance I am less worried about the Chinese blowing my house up, but don't pretend they're nice, or that they're your friend. I don't want them having my data any more than I want the NSA, Research & Analysis Wing, or the NK Reconnaissance General Bureau.
Again, the root problem of course is that there is any data to share in the first place.