I don't know Juice, no style AND they look like a pain to use. You have to either pull them up or lift the plane away from them to fly.
I bought one for about $18 shipped on eBay. One spike into the ground, but the uprights are hinged so they only fold one way. When you want to release the plane, you just pull it back about a foot and the restraint folds down. You're good to go.
Until I bought this, I used a piece of rope and a large screwdriver. Worked almost as well.
Dennis-