Instruct: Classify the given review into positive or negative sentiment.
Query: Great features, quality, and performance for the price

Well, the output from this amplifier sounds comparable to another fairly high-end unit I have, so that is good. It's a well balanced sound with no notable features (I'm not into megabass).Two other positives.First, it can drive A and B speakers simultaneously (or one at a time). But the great advantage is that they are driven independently: turning on the B speakers creates no dip in the volume of the A speakers, and vice versa - even with the very different speakers and cable lengths that I use on A and B. Not something you see every day.Second, it has robust quality. For instance, during a recent thunderstorm it went into "protect" mode when there was a dip in the power supply, rather than continue to operate and potentially die. And that was behind a surge protector, so it's pretty conscientious.Amazon are no longer offering this unit, but if you can find it elsewhere it's well recommended.