Based on the users' reviews of the idle landmarks app, here are three cons and pros: **Cons:** 1. "Glitches and bugs make the gameplay frustratingly slow and unresponsive." (15 words) 2. "Limited opportunities for customization and design options for landmarks." (15 words) 3. "Repetitive gameplay mechanics and lack of challenges to keep me engaged." (15 words) **Pros:** 1. "Visually stunning graphics and detailed designs of iconic landmarks worldwide." (15 words) 2. "Variety of landmark types and abilities to manage and expand my collection." (15 words) 3. "Huge community and social features to trade and share with fellow players." (15 words) Please note that these conclusions are based on the users' reviews at the time of my knowledge cutoff and may change as more reviews are added.