Yes but what can you use it for?

Customer Relationship Management
Quotations
Sales Orders
Purchasing
Stock Control
Invoicing
Leave Management
Time Recording
Expenses
Costings
Customer Portals
Supplier Portals
Link to your Accounts System

Yes there are standard packages which will deal with all of these and if your business is standard enough to fit then that is where you should go.  But if they ask for too many compromises . . . . . . .