The R2R-11 is a great amplifier/DAC combo if you’re looking for something different. There are many better options if you are looking for a clean powerful amplifier or DAC such as Topping D30 (DAC) and JDS Labs Atom (amplifier). It’s also not well suited for sensitive IEMs or headphones since the noise floor is fairly high. I wouldn’t buy it as your only amplifier without trying it first but it can be a solution for harsher headphones or non ideal music recordings.