I think the lack of response speaks volumes about the state of this topic. The reason, I believe, is the super low prices on the Siglent products and their seemingly endless hackability. From what I've seen with my hands on an RSA3030E I suggested a client buy last October, it's a well built product, not up to Agilent / Keysight standards, but very nice. My concern on the N models is the very limited cal kit support. Only 3 kits consisting of one of their kits, a second one with zeroes for all constants and a third, custom. That's pretty poor as you'd have to store a STATE setup for your kit X, run a cal and save under "cal with kit X" for instance, same for Y and Z, etc.
How do you like your unit?