While the AWS Cloud provides many additional components and services beyond what is offered by Elastic Load Balancer (ELB), Kemp’s Virtual LoadMaster for AWS has additional and enhanced features and capabilities that provide a rich set of integrated functionality, easily configured and managed via the Web User Interface. The same set of capabilities are available when LoadMaster, as an appliance or virtual machine, is used on premises. Having a common interface across all environments is a big advantage and provides a simpler, consistent management experience when deploying hybrid or heterogeneous cloud environments.

Features Elastic Load Balancer (ELB) Virtual LoadMaster 
Layer 4 Load Balancing
Layer 7 Load Balancing
Pre-configured application templates
High Availability
Clustering
Scheduling Methods Round Robin Only Advanced Scheduling Methods
Server Persistence L4 Only L4/L7 (Advanced options)
SSL Termination/Offload
Content Caching/Compression
VM Resource Availability Awareness
Header Content Switching
Header Manipulation
Health Check Aggregation
TCP multiplexing
Reverse Proxy
Advanced Authentication *
(Advanced Options)
Web Application Firewall Protection

* Supported by other services with AWS