It is very nice to be able to instant-cast someone at 41 yds range, no doubt. That 2-3 seconds that I would normally spend winding up a spell and waiting for it to land with the Shamans is gone. I still want to play with some nice big suprise/bursty combos, like 4xAimed Shots followed by an instant arcane.

Unfortunately, a lot of the uber-DPS-maximizing techniques (e.g. proper steady shot rotations) for PvE don't hold up too well while multiboxing. With even the slightest bit of lag, I can't really do much better than "hit steady shot every so often".

I really, really like being able to do some mana-less DPS as well. Nothing sucks more than being OOM on my shammies after a long series of fights.