It has its pros in cons in my opinion.
2014 Ford Focus
This is definitely an improvement to a stock head unit. It sure does pack a punch after tapping into the stock head unit power and ground, as described in the manual. Some maybe skeptical that splicing into the head unit power will be sufficient for an amplifier but I think it supplies plenty of power. I replaced the stock speakers with JL audio C2 series and had the gain on this amplifier at nearly 20-25% and it was quite loud.
Pros: Small and fairly easy to install depending on your vehicle. Provides a good sound upgrade for a stock head unit, so you can keep the factory head unit and still have searing wheel controls with out purchasing extra hardware. Small size also makes it easier to install with the ability to mount it in the front of the vehicle without needing to run wire across the whole car.
Cons: -No power indicator light or over current light. Hard to tell when the amp is actually drawing power. -A low level line out would also be really nice. -The speaker wire with the white/brown stripe was extremely hard for me to find for some reason, it almost looks identical to the white/grey stripe.