I spent almost 1000 euros on an oscilloscope, my DHO 924S, which doesn't work.
I will wait another 15 days, if Rigol does not solve the problem by releasing a stable firmware version, I will return the oscilloscope to Rigol Italia asking for a refund of what I paid.
You should have read here first, DHO900 is a poor choice. DHO 804 is decent value.
When I e-mailed Rigol about the DM800 series bugs, the responses were unbelievably bad. First response was they'd send my comments to R&D for investigation, which is total deflection because people have already commented about this so they surely know about it. Second response (first response from R&D) was just some marketing junk about how their DMM was better than their previous ones. I hit them again with all of the proof of the issues with links to Youtube timestamps and EEVblog forum posts and their response back was please provide proof of the issues, completely ignoring the proof already provided! They also said they weren't going to consider the issues reported on the EEVblog since they were from an "informal forum" and that they were not going to investigate the issue any further.
I completely get what you are saying, but to get a good response you need to make a very clear explanation of: what the bug is, why it negatively affects your work, and how to reproduce it. Single bug at a time.
Anything outside of that is just a suggestion that the support person may or may not care to pursue.