Advantages:
1. Higher gold acquisition per round than inferno levels. Can reach 100k when you reach later stages.
2. Dark items and inferno items can drop at rare chances.
3. Higher experience points earned
4. Very challenging levels because it's all bosses.
Disadvantages:
1. Very limited drops. Sometimes you will get 1 item or NONE per round of play but will give more gold, making much harder to get uniques.
2. Extremely hard to finish cause it will further slash your defense to 0% if you don't upgrade. Every increase in stage severely handicap your character until you are stuck.
3. Boss monsters increases per level and stages making it hard to progress.
4. Disadvantageous to players with weak equipment making you lose your patience and get frustrated.