If you go to that Batronix page, you will see that direct comparison to those R&S devices is not really easy, if we want to compare prices per what you get.
R&S NGU201 is basically 2-Quadrant battery simulator. That one does not compare to SMM3000X, another mythical device will have that honor.
NGU401/411 are 4-quadrant SMU devices like SMM3000X but they have different set of specifications. They have different power envelope diagram, do not go to 3A and 10.5A pulse mode. They have 20W max power compared to Siglent 30W. Siglent have better voltage programming accuracy and resolution, and more ranges. Same for currents.
Siglent has ±200mV range to ±200V so goes both lower and higher. Same for currents, ±10nA FS to ±10A. Siglent has Ohmmeter mode. More expensive SMM3312X is dual channel, so 2 sources in same case. Extremely compact.
NGU401/411 has faster sampling. NGU201 is dedicated battery simulator device that does things that SMM3000X does not.
If you go and compare to Keysight and Keithley SMU devices, you will see that they are all slightly different. Closest analogs are among the Keysight devices, but no direct model comparison.
Taking all that into account, I would say Siglent prices are very good. Device looks and feels very solid.It is very compact from frontal aspect but deep. They mount very well in racks, and are moving lots of air. They are not quiet. Their target market will probably mostly be sitting in the racks of some ATE in some factory and they are very well made for that, being versatile with their ranges. Use in lab is also possible but you can hear them when they are on.
For some users, SMM3000X will be best choice at any price (because it hits their requirements best), for some it will be good choice at very competitive price (which is not same as low price), and for some it will not be a good choice because it is different instrument from what their needs are. Tool for the job. In the market this device class targets, price is concern only after it can do the job. And then long term reliability and other concerns, because you will be building an testing jig that has to work 24x7, spend large amounts to write code, integration and be able to keep that thing running. Support in procurement, design, implementation and keeping it running will be predominant concern. Price of the device itself is fraction of the cost.
When people say "this is for professional market", that is the meaning. Completely different ball game. Completely different set of rules.
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