QuickBooks Enterprise

The ability to handle many customers and inventory items

The quality of customer support is low. I have to wait for long to get help

QuickBooks is known for being intuitive for a reason - it's checkbook style interface makes the user feel comfortable and familiar with the transaction process. In addition, the ability to edit previously entered transactions (with some limitations) gives the user confidence that they are not risking making an irreversible entry or at least a complex un-winding process.
The reporting function supplies almost any type of report you can think of with the ability to customize the "out-of-the-box" reports. Comparative financials for year-to-date are easily done (something that NetSuite doesn't do without manipulating the report date ranges manually).
The subscription costs are by seat and represent one of the best values in the accounting software universe.

My biggest problem with QuickBooks in the inability to separate the receipt and billing of inventory. One replaces the other depending on the order of events. So if you want to keep your AP aging true, then you are either going to need to change your date of receipt from the actual to the billing date which can create problems when reconciling inventory, or you will need to manually change the due date.
If you are dealing with multiple related entities (subsidiaries, companies, etc.) and you want financials to be specific to that entity you will most likely need to use separate company files. The user is limited to having two company files open simultaneously and any inter-company transactions will need to be duplicated in both company files.

I'm consistently impressed by QB Enterprise's interface. It shows you everything you need for the task you're working on and doesn't ask you to learn little tricks added to the system for aesthetic purposes that get in the way of functionality.

I've found its integration with Microsoft Office to be somewhat unstable. Connecting the software to Outlook for invoicing has not been an easily process even for our IT department, and sometimes it experiences problems exporting reports to Microsoft Excel which require the report to be rerun. But these are minor issues that don't get in the way of my usage of the program.