One thing I noticed is that potions that share the same timer, don't always have the same time. I can't give an example off the top of my head, but if you use a potion with a 5 minute CD and it shares a timer with something that has a 1 minute timer, you can't use the 1 minute one until the 5 minute timer is up. Slightly annoying...things that have the same time should all go on the same timer.