from my experience, if you have time, just purchase some bb stuffs first. Coz in the last two months, you will feel tired shopping around.
Regarding the bb show, depends on people. Some brands or shops do have promotions in the booth. You may like it. Some booth give out free samples or small gifts, especially when you leave them your contact info (for their later marketing use) or join their member.
I went there once when my bb was 1 yr 3 months. I went there on Sat afternoon with the trolley. It's so crowded that I hardly move and air circulation is not so healthy for my bb. Since I am not those people who care about smalll gift or sample, I didn't enjoy going there at all.
For me, when I do shopping, I prefer quiet atmosphere, calm environment for me to look around.....however, when you visit the booth in the bb show, it's so noisy, messy, busy and the sales are always very aggressive....that's why I finally didn't purchase anything at all.
If you are those person who like to walk around different booths, want to get different sample for tryout, compare different promotions, or even has time to visit the bb show on weekday....you can go.