We have both the Siglent SDS800 and the Rigol DHO800, well the Rigol is a clients that has run into financial difficulty, so likely to remain at "The Labs" for awhile.
We acquired the Rigol for said client and the plan was to teach them the DSO use for a specific application, so spent some time and became familiar with such.
Simply put, Rigol hit a Home Run with the DHO800 introduction, with the custom 12 bit Chip Sets, small form factor, nice screen (altho a bit dim), solid build, excellent UI, VESA, HDMI, nice probes and so on at a price point most could afford. As one popular Rigol Fanboy put it, "Game Changer"!! Which was true, this little Rigol DSO was quite remarkable in every respect, especially considering the price point!!
Needless to say we were impressed with this Rigol DSO, and this was our 1st direct "hands on" with any Rigol product, similar to our experience with our 1st "hands on" with our Siglent SDS2000X+ a few years back, both these folks have really done a superb job
When the SDS800 was available we decided to spend our own nickel, well the Rigol so far has ended up on our nickel as well
Simply put, Rigol hit a Home Run with the DHO800 introduction, then Siglent hit a Grand Slam with the SDS800 introduction
As good as the Rigol DHO800 is, and it's good, really good is every aspect, the Siglent SDS800 is just overall better IMO.
We have no brand preference, just have a preference for the best instrument for the task (know thy instrument so to speak), and when one factors in cost, the best value instrument for the task!!
Bottom line is you can't go WRONG with either the Rigol or Siglent, but as 2N3055 mentioned the Siglent is the more "Pro Like" Instrument, and more in-line with making quality/trustworthy measurement/observations rather than just playing around and tinkering, which is fun BTW
So when we reach for a DSO, now we reach for the SDS800, usually with the Rigol probes tho (these are really good, better than the Siglent IMO)
Anyway, how either one of these can be offered at this price point is remarkable and a tribute to both Rigol and Siglent, but honestly from a well seasoned old Pro who's used every piece of TE imaginable, one would expect the Siglent to cost ~10X......yes it's that good!! Heck one would expect the Rigol to cost ~3X also!!!
BTW we are NOT open for doing direct comparisons, we'll let that reside in the hands of others!!
Of course, as always, YMMV!
Best,