I've been running an ELB instead of HAProxy for about a month now on a site that gets about 100,000 visits per day, and I've been pretty pleased with the results.
A gotcha though (UPDATE, this issue has been fixed by Amazon AWS, see comments below):
- You can't load balance the root of a domain as you have to create a CNAME alias to your load balancer. Once solution is to redirect all traffic from
http://mysite.com to http://www.mysite.com.
Apart from that I really can't speak highly enough of the AWS ELB offerings. I'm also using the Cloudwatch monitoring and autoscaling. Oh and don't forget it's cheaper than running a small EC2 instance ($0.025 per hour instead of $0.10).
