I went to UBI for their basic two-week mechanic's course in 1984. Yes - '84. They did a very thorough job of instruction and hand's on experience. I knew most of the material, except for building wheels - which they threw in our faces first, the sadists - and I built my first set of wheels that day. And I am still building wheels. It was worth the cost for that alone. And getting to use tools I couldn't yet afford like facers and frame-straightening gear.
UBI remains one of two full-on bicycle schools in the USA. I can stand behind UBI without hesitation. For anything they offer. They are very good indeed.