Feature:
I though the amp would power an external speaker while playing through it's own speaker, but when you connect external speaker, amp only drives external speaker. It does have 2 line inputs and a headphone jack which is very convenient. It is plenty loud enough for small rooms or for a personal keyboard monitor, which is what I bought it for.

Value:
This is the best value out there for the small keyboard amp.

Desirability:
It's very professional looking and fits in well at our church.

Sound:
I use this amp as a personal monitor for my yamaha dgx500 keyboard at church. I have a Y connector coming out of the keyboard and send signal to the soundboard for sound guy to control stage monitors and house speakers and use this amp so I can hear myself playing when everyone starts singing and playing together. This set up allows me to control what I hear and anything sound guy does will not affect my monitor.

Overall:
It is great for a personal monitor or a home amplifier for keyboard. I will not replace it until it dies from old age. This amp is small, lightweight and sounds very clear with my keyboard.