After playing this game after two months one of the top things that frustrates me are the guild traders. I think I understand the principle behind it... Well kind of. What I personally would like to see (since there isn't going to be an auction house) is being able to access all the guild traders at once in a particular zone. It would still make players travel to each zone, looking for deals, but I don't have to go to each trader and search individually.
That brings up the next point of how horrible the search functionality is as well. No place to search by name, searching options reset at each guild trader you visit, and just an overall pain in the arse. It took me so long to search for a particular ring this weekend. Literally I would have to go to each guild trader and set Apparel > accessory > ring (when it didn't bug out) > vet rank > quality> look for item. I had to do this with like every guild trader in the game. It was sooo frustrating.
I think the overall consensus is the system needs some work. I hope for change someday...