War of the Chosen is awesome. I beat the game a couple of days ago and, similar to Enemy Within for XCOM, it feels like a whole new game and not just a dlc pack. The three new factions that you have access to (Reapers, Skirmishers, and Templars) really bring a very nice flavor to the game and they in and of themselves feel very unique from one another. I noticed right away that there were many improvements to the base game with HEAVILY reduced wait times for mission starts (2-3 seconds down from 1-2 minutes for me), better graphic quality even at lower settings, and less hitching and framerate drops. Some fun bugs I found were that if an enemy gets critically hit and dies their model will stay upright on the field and it looks like they didn't die even though there is no health bar, in addition to some teleporting enemies as they moved during their turn. However, these are minor and relatively funny instead of wrecking your game. I would highly recommend this game as I haven't been engrossed this much in a game in a while.