You're welcome. I think this thread exists by accident as there is no one else discuss the 1000B series.
IMHO issues that may affect your choices:
1000B is suited as a bench instrument and has no protection for power electronics use. Its natively a CAT 1 device. While it can help troubleshoot 3 phase VFD but you will need isolating the front end with a HV differential probe, which can cost as much as this low cost DSO depending on the frequency and rated voltage
The chassis is easily transported, but may not survive one drop to floor from 3'
FFT has ~ 50dB noise floor due to 8 bit resolution
FFT pick up spurs generated by the DSO, e.g. its SMPS or the internal clock, they are a constant so you can figure out which spurs are artifacts, spur amplitude can varies as you set the FFT
My 1054B is not rated by an electrical safety organization such as UL, ETL or CSA
IIRC, the DSO in the 1000B series are identical make except for the -3dB frequency response and available channels. However you can see the lowly 1054B can gives useful response to ~80MHz with 4 channels on.
Any 1000B can help audio applications, but audio specifically the "50MHz" 4 CH version is more than adequate
First of all let me thank Saturation for this long thread on 1054B. I am looking at this scope and GDS1102B for use mainly in audio amp service and 3phase VFD.
My question is which one will be better for each application. The faster FFT analysis of this scope looks impressive for checking the harmonics of VFD's.