Sitting outside in the fronds, find my item, click to buy it through the menu, wait 15 seconds for it to possibly work, have entire screen of people disappear and be unable to reactivate the menu to repeat the process again for a good 10 seconds.

If you have to buy more then one item from the same retainer you are just better off going into the wards and finding it. Like arrows, food, gear to materia, synth materials. Also if you want a certain level/grade of materia how are you going to tell if this is a tier 5 hp materia that gives 55 hp or 65 hp? How can you tell if any of the gear has materia in it already? There are just so many times you can't just see something and buy it because you have to go and check everything else to make sure there isn't some deal you can see from that menu.

It's a great feature in theory but rather useless right now EXCEPT for the timestamp of items sold which you can gauge how fast items sell. Also why no timestamp for chat yet?....

TL;DR New feature useless, timestamp rocks, better off going into wards and looking yourself.