I needed more control over my aplications (needed SSH, eaccelerator) and I upgraded from their Solar Cluster 3 to their 512RAM emeraldVPS.
Let me tell you the setup that these guys have rules in every way.
The only thing that runs on the VPS is Apache so you might have an idea that this may perform better in some aplications than most 1GB RAM dedicated servers that also run MySQL, mail and other services ...at a fraction of the price. MySQL, mail and dns runs on their clusters. I installed zend and eaccelerator, and now my busy Romanian blog (with wpcache) runs in 82MB RAM :)
Im going to move 90% of my sites there, I have lots of space and resources to grow.
According to cpuinfo I also benefit from 8 of these:
CPU model name : Dual Core AMD Opteron(tm) Processor 865

The support guys have always been fair and square to me, they answered fast to all my questions (mostly less than 10 minutes), moved my sites on the VPS and told me whats good and whats not so good about their VPS (yes, they told me without asking them about the minor "inconvenience" I may have with the VPS before I bought it). I feel they are the kind of guys you would love going to parties and drinking beer with.
Random screenshot of htop: http://www.oradeanul.com/Screenshot.png
I dont know what more to say :)