I, too, am a big fan of Jim Spivey - the coach and the man (might help that he coached me to my first sub-4 mile). Seems that at least one person on this thread had a less-than-thrilling personal experience with Jim, but I am yet to meet someone who has actually run for him who has a bad word to say about him.
..and, yes, he may appear a little quirky but show me a successful distance runner who isn't just a little nuts!!
I didn't run at Vandy so I can't comment on the specifics of that situation. However, my experiences with Jim have all been very positive.
Cheers,
Hilly