Bagpuss
Legend
I just started a session 0 last night on the Essential box set- Icespire Peak. It is fairly easy to read and play. I'm adding some stuff to it since we played the first box set and the town has grown since that time, but it can be easily played straight up.
Just finished the Essential's box, I must say I was a bit disappointed with it compared to the scenario in the Starter Box.
The first encounter the players are likely to meet is an easy TPK for 1st level characters. There is very little guidance on NPC roleplaying encounters (unlike the Starter box), the final encounter at the Icespire Peak is a huge let down.
The castle on Icespire Peak has virtually nothing in it, so you players can wander round searching for and getting bored, and the dragon once defeated gives no reward as it doesn't have a hoard, it's complete anti-climax. The dragon itself is a really hard to judge encounter, it's breath weapon can instantly drop and even kill outright weaker HP characters on a failed save, but at the same time if the fighter has got the Dragonslayer sword from earlier in the adventure it can die in one round if he uses action surge to get four attacks off.