Why do some features not work?
This is probably because they haven't been implemented yet, check the features list on the main page for features that are in the plugin. If its there and your problem persists then send a ticket (its probably a bug!)
Why should I use this plugin over Essentials Eco, or other economy plugins
Well that you will have to decide yourself, I would recommend my plugin because it has a lot of features Essentials Eco doesn't have but is still lightweight and not bloated compared to other Eco plugins
/money - Check your own balance.
/topmoney - Display top balances on the server
/sendmoney <player> <amount>
/bconomy - View BConomy commands available to you
/givemoney <player> <amount> - Give a player some money
/setmoney <player> <newbalance> - Set a players balance
/takemoney <player> <amount> - Take some money from a player
/purgemoney - Remove all accounts with the default balance
/money <player> - Show another players balance