Plugin has great flexibility, and Arcky is always improving the different features. Someone really willing to push realism in a game should use this plugin. It offers a great variability, and almost everything can be controled with variables too. You can automate speeches according to the number of badge, pokemon caught, etc. You can set the number of items available, and the time to refill stock, according to variables as well.
The last huge plus to me is to manage the entire shop systeme out of RPG maker, which make things much easier to update.