I have a medium sized one for Tom-Tom, but he prefers to squeeze into the smaller plastic log thing. Same with Jayke, I 've had the small rock cave thing since I got him & he prefers that over the larger one. Mine like to stay snug.
Leos do like hides with small openings. I think the half logs are too open even if you place it against the wall of the tank. I have one that's about 4.5"Lx3"w but when I used it, my leo always preferred its other hides. So I don't use it. Get a coconut hide!