I've seen posts about how (un)convertable D&D Essentials characters are to 4th edition. This is a question about monsters/encounters/adventures.
People have been raving about the Essentials Monster Vault and the adventure included therein. My problem is I just invested in a stack of 4th edition books. Can the monsters/encounters/adventures in Monster Vault (or other Essentials materials) be effectively used with 4th edition characters and dungeon master rules?
If work is required to either adapt or convert the monsters, traps, XP, etc. What would that entail?
I'm trying to figure out if I can/should ignore Essentials materials when building my 4th edition campaign.