slowrotor,
True, your slower approach may be the safest.
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The concept on the linked web page is that of providing a change in the disk area between hover and cruise. The result being a better Figure of Merit and a higher forward velocity.
It is the same objective as Sikorsky's extended blade patents are attempting to achieve.
The existing and currently proposed quad-rotors still put a downwash on the non-rotation wings during hover. However, more importantly IMO, it appears that their fore and aft rotors are not intending to take advantage of a higher induced velocity that is obtainable from coaxial rotors, which share the same stream tube.
In addition, all flight control, in both modes, might be obtainable from only; collective blade pitch and PropRotor tilt control.
Just an idea.
Dave
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Addition:
slowrotor you may find this web page interesting;
http://www.vstol.org/GermanVSTOLTransports.pdf