1. It's a rebranded China goodie. Set your expectations there.
2. Same lang mga amplifiers niya sa price range niya really. In fact some of them probably came from the same factory.
3. Will just remind you that "grounding noise" is usually due to installation error. If not, it's a defect from the unit itself (which you can then send for warranty). Pare-parehas lang performance ng mga yan.
4. Speakers are the determining factor on how you hear your sound. The amplifier's "flavor"? A lot less.