I have done my first instance and it was AMAZING... A few things to note though..

Please have the number system displayed on the target banner, it was hard to tell if I had 1 or 2 targeted sometimes.

All the bosses dropped either a leather or plate armor of which NO one in the group could use either. Maybe have some type of Smart instance loot where when you enter a instance it changes the loot to match what is in your group. If someone leaves and someone comes in have it update the remaining loot table with whatever class just entered. No idea if this is possible though.