Going through the spec sheets, the Rigol 3058 compared to the 3068, one thing is glaringly obvious. Other than the higher resolution, extra digit, and the Trend function, why on earth does the 3058 only weigh 2.5kg, while the 3068 is 3.2kg?
Does an extra digit really weigh nearly 1kg?
I guess we need to see all three of these Rigols in "don't turn it on - take it apaaart!" style
(But seriously, nearly 1kg? - OK if it was a linear PSU with a huge transformer chucking out loads more then maybe, but what on earth?)
Having said that, live data capture is a doddle. The 3000 series even have emulation modes for Agilent 34401A or Fluke 45. The only problem is all the Agilent/Keysight software like Benchvue & DMM clearly use *IDN? to check if it's the real deal. I'm sure there must be a simple way of fooling such software by replacing the *IDN? response from Rigol DM30xx to HP/Agilent 34401A.
I would have thought the Rigol engineers would have put that in the software, considering how well they did everything else to make the meter looks like a 34401A in SCPI mode. I expect some copyright thing or other put a stop to them masquerading...