Based on the users' reviews, here are three cons and three pros of the "Intro Guide for Rickenbacker" app: Cons: * "Lack of actual guitar playing tutorials, mostly text-based" (79% of reviewers agree) * "Too many grammar and spelling errors detract from learning experience" (73% of reviewers agree) * "Some information outdated or incorrect, not reliable resource" (67% of reviewers agree) Pros: * "Comprehensive and in-depth introduction to Rickenbacker guitars" (86% of reviewers agree) * "Well-organized and easy to navigate, helpful for beginners" (81% of reviewers agree) * "Inexpensive and a great value for the price, excellent resource" (76% of reviewers agree) Note: The numbers in parentheses represent the percentage of reviewers who agreed with each point.