[curiousfab]

Depends on what's "usable" for you :-)

This SDR won't be able to compete with expensive high performance receivers that have a lot of pre-selection, but there are many examples of low cost SDRs that do a surprisingly good job on the HF bands (without too much pre-selection).

I suppose the performance in the HF range will be similar to KiWiSDR, AirSpy, or the RedPitaya. If you want to know how well they work, there are many KiWiSDRs online to listen to :-)

The interesting part is certainly that it delivers 50 MHz bandwidth up to 6 GHz, which exceeds e.g. what the ADALM Pluto can do.

Certainly an interesting product at an attractive price tag. I consider getting one!