The 2 channel signal generator in my MSO1074Z-S doesn't appear to be monotonic. If I go from 999,999Hz to 1,000,000Hz, it goes down in frequency by about 10Hz, not up by 1Hz.
Why is this a big deal you may ask?
Well if you are trying to generate two phase-locked signals, say one at 500kHz and one at 1MHz, it doesn't work properly, one channel is not exactly twice that of the other.
Not sure where there are other discrepancies like this, but it's propably worth pointing out.