It is an excellent trade show. The seminars and conferences are also top notch and reasonably priced (much like NACHI). You may even get a free beer or two. Fall is a busy time for me to go though. I wish they would move it to February.
Highly recommend it - been there many years, and as late as last year. I took in 2 days of seminars on buiding code and building envelope. Speakers are top notch, and experts in their field.