I replaced the skids one time but really haven't had a need since then. More than a few hard landings before it broke the first time and now I really haven't crashed it hard enough to break them again. IMO they are strong enough after you get over that initial stage. I did replace the styrofoam balls off the training gear with some from wal-mart that are practice foam balls for golf. A bit bigger and good light fuzzy foam that I am happy with, absorb shock better and don't try to spin.

On a side note, dont pay attention to the video when it tells you to glue the rods for the training gear on to the skids. I replaced the main gear and just wanted to use my old skids but had to buy them too because I couldn't get them out of the old gear without em snapping like twigs