Effectiveness:  

ESET NOD32 is certainly an effective antivirus solution for businesses, protection endpoint user workstations and the server itself. The antivirus kernel is Virus Bulletin 100% approved and has received multiple awards, including from the Anti-Virus Comparatives.

In fact, ESET has received the most VB100 awards in the industry, and has never missed an in-the-wild virus. Their proactive threat detection is second to none. Furthermore, in comparative tests, ESET NOD32 is less taxing on your system and memory, faster to open applications, and quicker to boot than almost all of their competitors. Source

Part of the reason why ESET NOD32 Antivirus for Business is so effective is because they utilize a number of advanced technologies and optimized functionality. The protection covers you from every angle, and is amazingly effective at discovering and effectively dealing with a variety of security threats.

Scalability:  

ESET NOD32 Antivirus 4 Business is amazingly versatile when it comes to accommodating individual businesses. Subscriptions can be purchased for 1 or 2 years, for 5, 10, 15, up to 10,000 users. The license manager includes tools to help you manage multiple licenses with different terms. The software fully supports Cisco NAC (Network Admission Control) compliance, and effectively uses network bandwidth for improved performance across the company. ESET NOD32 Antivirus 4 Business also supports Oracle, MySQL, and MS-SQL databases.