I understand all this, I was just pointing out the limitation of the cheapest option, and that signal integrity can be an issue due to the compromises made.
Sure, but have you compared that to other devices in this price range? It's not a valid criticism of the Rigol unless you do a side-by-side comparison with others.
I'm surprised just how poorly it deals with the Sin(x)/x interpolation when running close to nyquist (it also looks nearly as bad with Sin(x)/x off, including the pre-shoot etc).
Sin(x)/x isn't magic, it's a theoretical thing that only works perfectly if you apply it to every sample in the entire waveform (which obviously no oscilloscope can do).
What you see on the Rigol isn't a bug, it's exactly what the math says will happen if you only apply Sin(x)/x to a few samples on either side of the pixel of interest.
Assuming the Siglent will be better than this might backfire on you. The 200MHz model has the exact same ratio of samples to bandwidth as the Rigol.
...if you have 3+ channels enabled
Another red herring. With more channels enabled the Rigol reduces the sample rate so this is expected behavior, predicted by the math.
In Rigol it is bug or better say, design error when they implement Sinc filter.
Violating simpliest rule: Draw via real sampled points.
But no, Riglol flush these to garbage. They have started this math error many years ago first with DS1052E and never corrected.
It was proofed with DS1052E and data can still find from blog history, perhaps.
They repeat same kind of bug again with DS1054Z.
One example can find here.Rigol do not listen anybody. Perhaps they think "who cares" because sales is ok. They care sales, it same if they sell chickens ( I wonder why they do not, perhaps profit is even better) or osciolloscopes. Who cares if sales is ok.
Personally I have not seen this kind of fake in any other oscilloscope, never and I have really some experience. Take Tek, take what ever Keysight - Agilent - HP, LeCroy, take what ever chinese Owon, chinese GoodWill, or as far as I know what ever other <long list> than Rigol you can not find this bug.
One nice bug in Rigol is junk mask test. Speed depends test result. Oh well, then you write down how many times test pass and fail (you read these counters). Then you show your statistics and first who know this bug can shoot down your statistics to garbage. Also this is small thing but... again. This is test and measurement equipment. Not entertainment TV (or is it - just for fun play).
But because I am biased (1% *), because my side hobby is also selling things and not only doing real work and hobby with electronics I do not add more things here.
*) My main interest is hobby and work. only < 1% income have any relation with selling Siglent or what ever (exept when I sell myself). But, yes I'm biased, but owners who hate or fall in love with some equipments they are of course totally free from any kind of bias (buuhh...) - as can see here..