I went last year for the first time. Was planning to go this year but the weather reports scared me so I'm staying home (I live in the Washington DC Suburbs).
I thought it was heavy HO and N but still managed to bring some very clean Lionel Postwar last year. Personally, I thought the layouts were worth the price of admission alone. Some real talent - museum quality art - on display. The real steam engine running up and down the parking lot was just the icing on the cake!