The Hlly Tamp-20 has the most annoying power LED ever, a blinding green light. If you can get past that though, it's a great amp. Actually, dimming the light is straight forward. The front panel removes easily with four hex screws. Pulling the led back so it sits behind the front panel reduces the light to a tolerable level.
Surprisingly, it sounds different than my other TA2020 amp, the Topping TA-20. It's not as loud or powerful, but it's very clear. I have trouble with audiophile vocabulary, but the sound is crisp and clear, maybe a little less boomy than the Topping TA-20. Construction is top notch, and it's a very attractive piece of equipment. Mine has a different appearance than most of the Tamp-20s I've seen on the internet. The logo is shiny silver, and looks good against the matte silver of the faceplate. Most of the ones I've seen have a black logo. The only other gripe I've got is the rear mounted power switch, a small annoyance. I have no trouble recommending the Hlly, especially as they are sometimes sold without a power supply for around $50, significantly cheaper than the Topping.