I bought this out of curiosity and I have to say that I am positively surprised by the sound quality and overall workmanship. No hiss, no pop on turn on, just a minor squeal for the first couple of seconds of operation. This is actually an entry level Hi-Fi component, under several conditions: buy a proper power adapter, connect a quality source (i.e. FX-Audio DAC X6) and a decent pair of speakers (I am using a pair of vintage Celestion 1's - quite bright and airy). ). Do not get me wrong - this is not meant to replace your 1500 USD unit, but if you are looking for a really good spare or secondary amp for your office, garage or bedroom, or just want to show off a surprising Hi-Fi novelty to your audiophile friends, buy this little guy. For this price it is a steal. You can also replace the NE5532P clones with a set of TI-made NE5532P op-amps for a boost in sound resolution. BT unit also works and sounds OK.
There were no major delivery delays I was worried about when making the purchase. This is my second purchase of this product. There is no pop noise generated when the power is turned on / off. The noise when there is no sound is almost inaudible. The sound quality is also excellent. This is my favorite TPA3255 amp.