AVG Internet Security is an above average suite with below average extras. In fact, it has almost no extras. The exception to that rule is its advanced email scanner. It does however perform very well when it comes to virus scanning and email scanning. For someone who does not need parental controls or backup features, AVG is a good match.
Firewall:

AVG's firewall is good, but still needs some work. It doesn't have much of a default configuration to speak of. It does have a couple settings for a standalone computer or a computer on a domain, but they mostly change what programs are blocked by default. This is a good start but requires that you approve or deny every program that you connect to the Internet with. Beyond the little issue of default configuration, AVG's firewall is very strong.
Antivirus:

AVG AntiVirus has been a force in the antivirus market for years. Their reputation among computer users is nearly flawless. The virus scanner they have developed is certified by ICSA, W.C.L and VB100%. These certifications are a measure of how well an antivirus utility does its job. Having all three of the certifications listed above is uncommon and shows a commitment to creating an excellent product.
Antispyware:

The antispyware scanner included with AVG Internet Security is one of the most effective in any internet security suite. There are some that are on the same level, but none that are better.
Grisoft thought to include an ADS scanner within the main scanning features included with AVG Internet Security. ADS means Alternate Data Stream and is a way for files to be hidden in a place on your computer that most security scanners do not see. Having the ability to look in these places and find spyware and viruses is extremely important in keeping your computer clean and safe.
Other Security/Features:

Grisoft didn't include much in the way of extras with AVG Internet Security.
Ease of Use:

AVG Internet Security is very easy to use. Most of the configuration is already done for you with the exception of the firewall configuration. The other stuff pretty much stays out of the way and doesn't let you know it even exists.
Ease of Installation/Setup:

The installation of AVG Internet Security is mostly easy and to the point. The install is pretty smooth until you get to some of their configuration questions. Some of the questions can be confusing if you are not an advanced user or experienced with AVG.
Help/Support:

AVG Internet Security has several help and support options available. The application help is helpful, but can be a bit anemic when it comes to more advanced features. AVG also has an online FAQ and email support. Enterprise customers have some other support options as well.
Summary:
AVG Internet Security performed well in all of our testing. It caught all of our viruses we tested it with and stopped all spyware we attacked it with.
The major downfall to this security suite is the significant slowdown of our test system while it was installed. Boot times were about 20 seconds slower and opening just about any program took at least a few seconds longer than normal. The lack of extras was a significant issue with this product as well. These issues are something to keep in mind while you search for an Internet security suite for your computer.