The unoccupied volume is not a problem for protection of the brackets, since they can be held by two pairs of elastic.
By cons, this unused space is pretty useless for those who do not have a DSi XL ... and it might be interesting to propose a second model a bit smaller for those seeking a little bulky cover.
Otherwise we are dealing with a product rather reassuring. The hull is stiff enough, the inner lining is soft, elastic well maintained consoles.
What shocks and protect the console from scratches during transport.
Note the possibility of slipping 3 DS / 3DS cartridges in three small nets, which is always useful.
Again, nets perfectly maintain the cartridges.
Otherwise, I did not notice any problem finishing my copy.
So nothing to report at the seams or the zipper
Regarding aesthetics, everyone appreciated according to his own tastes, but personally I like the plain black, sober and class.