WSPR as Propogation Early Warning for QRO SSB or CW Ops?

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vk4folo
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WSPR as Propogation Early Warning for QRO SSB or CW Ops?

I am interested to know how effective WSPR is as a method to tell when a particular band is open. Obviously a low power CW beacon gives a good indication of band conditions for the path to/from the beacon. Given WSPR uses some fancy coding/decoding and error correction, does this mean that it isn't as effective an indicator that the band is open for QRO SSB or CW operations.