There were some concerns about the Bambu a little bit ago, but I think they back tracked on it after consumer outcry. I can't remember exactly what it was now. This looks pretty cool though and I like that there are starting to be more practical uses for these devices besides just printing tchotchkeys. I have an old Dremel printer in my office.
I think they restricted what other software you can use. I do not see that as a huge problem, but some people like to have more options. I have seen their printers described as for people who want to print rather than those who like messing with the printers themselves.
I am a fan of open source stuff, so I can understand why people would be upset.