I splurged on the 2 Day pass so I could get in early. I'm glad I did, not for the swag, but to beat the crowds. Stepped out for some air about noonish, and the line to get in was literally around the block. In the morning, I was able to bop around from booth to booth and speak to people. In the afternoon, not so much. That was a good time to watch the aquascapers at work. Just watching, I learned quite a bit.
There were plenty of plants, fish, and shrimp for sale. Since I was away from home for another two weeks, I wasn't buying anything; was mostly there to learn.
If you are looking for deals, Sunday afternoon is the time. Vendors don't want to pack stuff up; they want you to take it home.