Oh wow, it looks like the quality of pre release sleeves are very inconsistent even within a set... >__<
I especially hope that the Rotom sleeves I'm going to buy will be of good quailty. I'd absolutely hate it if they broke quicky. ;__; If I start playing more (depends on how the X&Y TCG turns out) so I attend tournaments (this season I will only attend the Finnish Nationals with a loaned deck), I would probably use the Rotom ones only in tournaments...
I would have loved to buy some golden Regigigas sleeves, but they are sold out where I'm going to buy these (they have: Rotom, Arceus, Dusknoir, Weavile, Leafeon/Glaceon and Professor Pokéball). I also read that the Gigas ones are really good. :C
Right now I only own Giratina sleeves, and they are great. I have used them for years (not very heavily, though, but still), and I have had no problems.
Btw. it's a real shame that the Garchomp sleeves suck. I think they look great. I like the colors and my favourite deck has been Garchomp/Altaria for this whole season... ;A;