Its overpriced and underpowered. Linode, RackSpace, and many other VPS providers perform better and are a much better value.
To me where it makes sense to go with a dedicated or self-hosted solution is when you start needing servers with lots of RAM, because all of the VPS providers will gouge you when you need RAM. They will charge much more per month for the server than the cost of the extra RAM chips and CPU and you will have paid for the server within a couple of months.
I think that VPS providers will have to start lowering the prices for their higher RAM instances pretty soon because RAM prices have gone down so far.