Never used it but I see one possible flush issue and one longevity issue.
While flushing if the garden hose does not supply more water then the pump wants, the valve will open and allow raw water to mix in.
How long will the valve work without flow issues, what kind of maintenance is needed, and all it would take is hang one time and there could be a problem.
If you really want something like this I would look into a ball valve Y or straight with a hose fitting adapter.