RE: duck configuration pros and cons
interestingly my canard (own design - based on Andy Lennon's canard design chapter in RC Model Aircraft Design) is quite tricky to fly in gusty conditions. It's far easier in still air.
It is hard to land - the landing approach has to be very shallow - this I believe is because the rear wing is nowhere near stall and is always in a (relatively) low drag configuration, with small amounts of induced drag?
The design has swept aft wings and fins on the wing tip.
it is stable in pitch though - can't stall aft wing.