Please, if someone knows, I'll like to have some feedback about the Watch Trading Association (WTA) show held in Munich 3 or 4 times a year.

There's all the basic information on the official website http://www.wtashows.com/ but this is paid membership I'll like profit as much as possible and avoid common mistakes, by having some tips for assisting the first time, preferabely from someone with first hand previous experience with the event, such as:

- Is it worth it?
- I've been told that only cash is accepted for purchases, any security advice? (for a buying budget of 2-3 watches between 10k-25k max)
- Any tips/comments in general
- Buying Papers/No papers
- Authentication

Not looking for all the answer but if I'm missing anything, everything is welcomed as advice.

Thank you in advance!