John, Bernie
I'm also very happy with the performance per dollar of my Rigol gear, including a new RSA3015-TG spectrum analyser I bought to replace a well-used DSA-815. I have a couple of other Rigol items and, in general, find the equipment functions well with pretty good ergonomics. Emona, the local Australian agents are efficient to deal with but I frequently find myself on the North American site to access the best curated information (including FAQs, application notes etc). In my experience it's fair to say that North American Rigol are carrying a big load in terms of practical global support.
The not-so-good news is that Rigol International are hopeless in responding to technical queries, with most communications apparently ending up in the bin. It's also apparent that the local agents are at the end of a long chain, despite doing their best to be helpful. Brought up on the old-style HP manuals, I find Rigol manuals to be barely adequate and, in particular, there are no block diagrams of the instruments - even at the highest level. All this combines to leave in the dark the user trying to use the gear in anything other than the basic modes. Mind you, even new Keysight manuals are not the equal of the old manuals in this regard.
In general, experienced users can set aside some of these concerns and just get on with it. However, with the RSA3015 in particular the integration of the real-time and sweeping analyser functionality is very poorly described, with gross features such as the step in displayed noise floor around 13 MHz not even mentioned. And don't even think about looking for the origin of low-level (but within spec) spurs, or the use of the trigger out! (Hint: it doesn't work as described in the manual).
I have the feeling that Rigol would be much better off engaging the North American company as the global support service and perhaps engaging engineers affiliated with that company to produce some decent documentation. I get the strong feeling that the main aim of the international company is to fill shelves associated with automated testing etc. It seems to escape them that the poor quality of manuals and explanations is a real impediment to "sophisticated end users" who stretch the gear. Of course, these users are just the ones to cultivate for continuing product development.
73, Peter.