Some of them do not own a Rigol DSO because their evaluations of both documentation and instrument revealed that Rigol is deceitful and makes poor quality products.
I do not need to own a DS1054Z to know that it is a poorly designed and low quality instrument. That flawed PLL design should have been caught by quality control. So should the likely hook problem reported in another discussion recently.
Again, it was not a PLL design issue, it was a software bug, and it was fixed.
From my experience, DS1054Z is not low quality at all, and considering its features and specs, and the fact that all its software upgrades can be unlocked for free, it's a great tool. In fact, it is so good that even today, at 3 years after it was launched, it is still unbeatable for its price. There is no real competitor for it.
Yes, sometimes there are bugs, but most of them were just corner cases, nothing that will make the whole oscilloscope unusable. All complex instruments have bugs, because all of them are, after all, software driven. Even the very expensive ones from the biggest manufacturers have bugs. And yes, I worked at the office with oscilloscopes 10-100 times more expensive then DS1054Z, and they are definitely not 10-100 times better then a DS1054Z, they are better, but not a big difference, they are almost the same.
Anyway, everyone is entitled to have an opinion, and mine it is that Rigol is not deceitful. On the contrary, they are making good instruments at an unexpectedly low price.
In my experience, DS1054Z served me well for 2 years, it's a keep, and if it would be to buy today a $400 scope, then I will buy it again, without any hesitation.