it's definitely a much bigger jump than I was expecting! Not sure what kind of magic they are bottling but it's pretty nice. Could just be my expectations were so low that any improvement was a major wow! Was running a 789 prior to the burson. I wouldn't get the Burson for the clears though. I still run my clears on my xduoo ta-26. The clears love tubes. Heard the Rebel is a great solid state amp to pair with em. A bit warmer and more tube like. Got my Burson open box so round 700 ish.. worth it and then some. I use my open alphas on it as well as my hd800s. The clears I run on it from time to time but mainly they stick to tubes.