I've got the MDO-2204EX with the SA you mention, and it is really high resolution and high update rate. Even with 1Mpt FFT resolution you get two digit FPS update rates, so I'll have to agree with the advertizing material - It is really really fast and high resolution.
Another cool feature is that you can adjust the display in the frequency domain exactly like I do on my SSA3021X. It's a big convenience factor that you don't have to switch to time domain and adjust the resolution indirectly by changing the timebase. You can set Centre, Span, Start and Stop frequencies so it's quick to zoom into areas of interest.
The auto measurement function is also nice to work with. You can define the size of a peek table and it will automatically show the amplitude of the number of highest peaks you selected and mark them on the trace with real time updates.
All in all I think these scopes are incredible value for money. I have replaced a $20K LabView NI rack with this $2K multiscope for desktop and fault insertion testing. The LabView driver is really simple to get running. It's also nice to use for manual measurements. I've even bought two for work because I prefer them over the Keysight 3000 scopes we normally use. It's been a really positive experience so far (for me at least ... YMMV!).