We have a lot of Rigol DM3058 and DM3068's at work that we use in a pool of test setups, accessed remotely. I have learned to really detest them, as they sometimes stop responding via USB and cannot be reset, or they do respond to USB but do not do the things they were asked, though they pretend to. This can happen after a day, a week, a month. It has gotten to the point where we have had to put all the units on an IP power switch so that we can hard-reboot them remotely. Ugh.
I have a personal SDM3055 which I find is really great. Works fine, I used it remotely (I use it mostly over the LAN) all the time as well, no lockups, nice screen, etc.
34401A is what it is. I have a later HP-era unit. Mine has only GPIB and I don't have the hardware to control it. It gets used a lot less than the Siglent because of this. (My test setups are often separate from where I work). I also don't need the 6.5 digits.