Ours has become the home for a pen so far! Always handy to have places for those little things that get lost....
Have a look at the under seat storage for the slightly larger things like torches, what have you! Doesn'tyour car have one under the drivers seat?
I find they're a perfect fit for my sunnies. And with a lens cleaner underneath, the glasses go in 'lenses down' so no chance of messy finger prints. For me it's not a gimmick at all and very useful. Saves dangerously struggling with the glasses case while being dazzled!
I have 4 pairs of sunglasses - only 1 pair actually fit in the holder - the other 3 are all the wrong shape. Not that you would think that to look at them - it's not like they're huge Elvis-style frames or anything! And they all fitted in the holder in the S-max!