my god finally i have this amazing amplifier and I have zero regret way more cooler then the photos of this page and way more smaller that i thought this would be this is my first amplifier so, i can't quite compare to others but if your not an audiophile, like not havin lots of amp and expensive headphones i think you can definitely hear some changes with your favorite songs this is my second day havin this so, i don't know about long time usage however, that smooth red nob with the orange light is just... feelin soooo right, not like other amp or portable amp that you have to buy another accessories for just using a freakin thing but found tiny~ like microscopic con and worry con was when you switching that battery thingy lever on the back panel if you place the lever to death center, the device will go off just like that so you need to boot up again and the worry is! this thing have air holes, you can actully see the circuits thus need extra caution when you go portable