I expected Rigol to not last as long as my Tek 2445A, but didn't expect it will need repair within 2-months. The scope still "works".... just gives the wrong answers for Channel 1.
All in all, still a great deal at $100/ch... just buyer beware of QA and long term reliability.
On another note, my 2445A also developed a similar problem with it's Channel 1 (wrong readings) and I traced that problem to it's attenuator, one or more internal relays not working properly... but hey, it's a 1987 era equipment so that's to be expected, mechanical parts starting to fail.
And a few days ago, I was thinking of getting a Rigol signal generator to replace my Instek one.
Instead, I just got today an HP 8904A, which is more suited for the audio work I'm doing. I don't need Megahertz range, but the 8904A's balanced out and floating ground capability and other features will be more useful to me.