The free AVG 2011 has been revamped from the ground up. There's 2 ways to install, online installation and offline installation. If you install online you first download the bootstrap application which then oversees the rest of the online installation. Note if you just have one pc the the online installation would be more bandwidth economical.

Off line installation is by a standalone application which is 135mb. It seems to come compiled with all the language options, virus signatures and runtime libraries contained within. This makes it a little larger than the online install which obviously selects appropriately and doesn't download anything unnecessary. The offline installer can be used on multiple pc's in which case it would be a big bandwidth saver.

The first update after I installed it was fairly small at 12mb and just contained very recent virus definitions.

The first scan took quite a while, nearly 20 mins was 'optimizing' and the remaining 40 mins was scanning. The pc I tested it on is my backup server which is fairly hefty with several terabytes of mixed date across 8 drives so I was expecting to be in for the long haul when it came to scan time.

It found several false positives which I was expecting and excepted from further scans. I planted a couple of examples of suspicious files and the second scan in all fairness took around half the time and it found them all.

It doesn't seem particularly resource heavy in real time use or during scheduled scans but it did clash with my spybotSD teatimer which I've had to disable for now. I submitted a bug report and they replied that it's a known issue which is being addressed.

I'm happy to run it for a few weeks and if no problems become evident I'll probably install it across the board.