i have one (well two) from their kickstarter. It's not a very powerful amp, but is a decent DAC. The chip includes an amp section that is good enough for efficient headphones - they sound clean and quite neutral to my ears. If you need plenty of power, this isn't for you. IMO this is a match for people on the go, laptops, tablets, and phones, devices that usually skimp on audio section, that kind of thing. a lot of power does not make sense here. besides it will be obviously much less portable, it will drain the battery really fast.