I went to the Apple store 2 days ago to purchase an Incase Slider for my black 32GB 3GS. I picked out a black one and when I went to pay for it the woman working asked if this Slider was for a 3G or 3GS. I said 3GS and she suggested a Slider from a different sales rack, but still black in color, said it would fit better. I didn't pay too much attention when it happened, but now wish I would have so I could report to you guys why she did this. My new Slider fits like a glove, maybe Apple knows about this issue?
That is interesting. I had the white slider on my 3G for a while but quit using it because of the bulk. It fit very well but did allow dirt and other particles to get between the case and phone thus scratching the bezel. (I had my phone replaced due to cracks in the plastic housing; the girl at the Apple store suggested the slider caused cracks on my phone; the apple genius disagreed with her..)
My friend has a maroonish color slider on his 3G and it doesnt seem to fit as tight as mine fit in the white slider. Maybe different colors yield different fits..?