Sheble's is a certificate mill, pure and simple. I lost any respect I might had for Sheble when I heard him admonishing others to falsify their logbooks in order to gain employment. I've seen him begin a practical test with one person, abandon them and take their airplane to give two more rides in another state, while the first person waits on the ground...using the first person to pay for the cost of flying him around from airport to airport to conduct his business. I saw several travelairs of his that appeared to have more oil outside the engine than in, and which were missing on both engines.
As for a passing rate...what does one expect? The owner of the school is the desigated examiner for the school; he passes whom he will. In my observation he isn't very discriminating, either. Basically pay for his course, walk away with a certificate. If that's what you want, then fine...but I wasn't impressed.