I have found them very unhelpful, especially the company that sells Rigol equipment over here in the UK. We had no end of trouble with our unit, which was nearly a grand with 16 channel MSO. The soft scope buttons always felt awkward. Personally, I'd give them a miss. Our's sits in the lab in the corner and is not used.
In fact, for low frequency stuff (485 comms and logic etc.) my £6 logic analyser with Pulseview has proven many times more useful and far more reliable than the Rigol scope ever was! Such a shame but there you go.