After analyzing the user reviews of the "1 Dollar Piano" app, here are three cons and pros in 15 words or less: **Pros:** 1. Unique interface makes learning piano fun and engaging for beginners. 2. Affordable subscription model with no hidden costs or in-app purchases. 3. Pleasant sound quality and variety of songs to play along with. **Cons:** 1. Limited song selection and repetitive repertoire is a major drawback. 2. Lack of customizable settings and options for advanced users frustrating. 3. Frequent crashes and glitches disrupt the overall learning experience.