Just by random chance encountered this thread, I have one. It's not entirely new (out for like 4-5 years I guess, was a lot cheaper back then), and technically it is mostly the same as the ET4410, apart from the software, as far as I can tell (at least the analog board has printed ET44 on it, so that part seems to be the same).
The user interface does have its quirks, but for normal day-to-day usage it works quite well, it's fast to boot (less than 4s), completely silent, outputs pretty neat sinewaves at the set frequency (verified, as far as reasonable, with the scope), and is quite stable in its measurements (also can be seen in quite a lot of electronics youtube videos sitting somewhere in the background...) - so if I just need to do some quick measurement I often end up using it instead of one of the better DMMs, just because it's so quick to be online.
For nice graphing there are a few minor issues, but you could PM me, I've written some Python script that works around most of those, as the device can be remote controlled (mostly for "hunting down" resonant frequencies, but should be easy enough to adapt).
I would suggest getting replacement cables, though, the ones coming with it are not too bad, but since I replaced them it works even better (better reproducibility of results in particular).
There is a JTAG port inside, and I would expect putting the 4510 firmware onto a 4410 might actually convert it (unless they did something to the analog board), but for lack of a specimen to test it on I couldn't verify. The front-panel board seems to communicate with the analog board using some 9600 baud UART (IIRC), I didn't go any deeper than that for lack of time, didn't take any pictures of the inside either.