This was my first show - and I have to say, if you're into cars, this is a great experience.
I want to point out that this is 'supposed to be' a industry only show, and you can't get in unless you have proof that you work in the industry.
Its not real hard to get a pass... but you can't just go online and get a pass.
I used to work for American Racing, and SEMA still shows that I work there (last time I checked) so I might be able to go that route.
I've been 4-5 times, and my 71' Hilux was a "Feature Vehicle" parked outside in 2009, which was the last year I went.
Here's a few things i've learned:
Going two years in a row sucks because it seems like nothing has changed.
Working the show really sucks.
Everyone says its not as good as it was X number of years before.
If you're a car person... going for the first time is the most amazing thing ever. In the history of ever-ness.
Your feet will hate you on the second day.
You can be there all 4 days and still not see everything.