Hi Guys
It's a great topic of discussion since there really isn't much for comparison in full scale or model aircraft.
Most all of the landing gear designs require you to simply take off and land vertically. Whatever skids are on a kopter they aren't really skids for sliding across grass or whatever, they're just there to give the kopter something to sit on.
not all flight controllers handle the odd flight dynamics of ground effect very well and some will simply flip over if you keep the craft just barely on its gear while trying to play with the flight controls. the original X650's were notorious for this, they'd just flip over if you didn't just power up and fly off the ground. for the new folks, ground effect if the cushion of air that is created when the kopter is close to the ground and the airflow from the props has no where to go. it's like the craft is sitting on an invisible platform and it will hover in it with less power than it would take to hover at higher altitudes. it's very noticeable when descending to land. the kopter will be slowly and steadily descending but as it gets closer to the ground it will just stop coming down and hover.
As for landings, I find it best to fly down close to the ground and then hover a foot or two above the ground. I try to get the kopter stable and hovering over one spot (there will be some control inputs held to correct for wind drift) before reducing power and letting it come down slowly. As you reduce power you have to continue to hold your wind corrections in so the copter won't be moving across the ground as it touches down.
Two things to keep in mind, if the kopter begins to settle too quickly as you near the ground you have to ease a little power in to slow it's descent but as it touches the ground it's best to turn the power to the motors off completely. with MK you just go full back and to the left with the left stick. I seldom land and leave the motors running. This habit has saved my props a few times as my habit of killing the power makes it automatic for me to kill power on bad or jumbled landings where I might put a prop or two into the turf.
Hope that helps!
Bart