Based on the users' reviews of the "Core Course for MainStage 2" app, here are three cons and three pros in English, with 15 words limited for each item: **Cons:** 1. Some users found the course content outdated and didn't align with latest MainStage features. 2. A few reviewers experienced glitches and technical issues with the app. 3. A small number of users were frustrated with the course's pace, feeling it was too slow or too fast. **Pros:** 1. Most reviewers praised the course for being informative, well-structured, and easy to follow. 2. Users appreciated the video lessons and interactive exercises, which helped them learn by doing. 3. Many reviewers felt the course improved their overall understanding and skills in MainStage, with some even feeling more confident in their music-making abilities. Please note that these points are based on a snapshot of reviews and may not reflect the full range of opinions.