Remember that GW 2 is supposed to have a flat (or mostly flat) leveling curve. So it's not like you'll blow through levels 1-10 and want to save all your XP stones for level 70+.For the exp boost it is VERY important how long it takes to level in hours. If short => okay. If long => not okay.
The kits and repair canister are only okay if they are permanent with a cooldown
Resurrection stone same thing actually, give it a 30 minutes cooldown or something
Didn't we have res scrolls in GW 1? What remains to be seen is how we'll acquire res stones in GW 2 without the use of gems.