At first she didn't want to go into it, I'm thinking maybe because I bought the blue, which probably looked dark inside to her and there was a bit of trepidation which would not be unusual for a child of one! Of course it was cold in January around her birthday so it was first used in the house, which of course effected the light situation even more so.  I was going to purchase the light green one at first, then realized that in the summertime, my daughter would probably put it in the yard for her to play in and I didn't want it to show dirt so easily.  I looked at other brands and styles and saw that the worst complaint was that the wires that give strength to the tunnel were a bit uncomfy on the knees, so I looked for a style that had extra padding over the channel the wire was fed through.  It's held up well so far and even if it only lasts 2 - 3 years, it will have provided the fun that was intended!