Siglent does have some nice stuff. That probe check/calibration feature seems really innovative and cool. With my experience with Siglent scopes (somewhat low end SDS1204E-E) was that the measurement versatility was not there. I literally begged them for the ability in the user interface to be able to set the mid-reference points for pulse width measurement and really never received any response other than from the local rep saying that he entered the suggestions. I was also told to read in all the waveform data, and calculate the PW based on the 10% down (90%) points. <Sigh> At that time, I couldn't figure out how to read that data. I am sure I could do it now, but I am not revisiting that. I would loved to have bought a higher end Siglent, but I had no trust the I could do that on the higher end models since it seemed like a "new" and "interesting" idea to them. Both Agilent and Tek had that capability going back to their earliest digital scopes. I had sent a question asking that about their higher end scopes and never received a response from them. So, I went with old models of Tek Scopes. Another reason is that all my industry specs seems based around the Tek TDS3000 series. Siglent scopes are as sexy as they come though.
Looking at the baseline offset of the MSO4104 makes me wonder if a calibration house that knows how to actually calibrate (tweak) the scope (maybe Tektronix themselves) knows how to calibrate the baseline offset calibrator, could fix that offset, or if that is normal for the MSO4000 series? I get ISO17025 accredited calibrations and data on my equipment, but for $150, I think TMI more, or less, is sticker changers. Their data books are great and comply with ISO17025, but rather than perfecting the instrument, it is good if it falls in-between X&Y. I have a work around for it now in my utility software, but being a little OCD, it's hard to ignore - lol.