- Virtualization: KVM
- Linux servers: Ubuntu, Fedora, Debian, CentOS
- Non-Linux servers: FreeBSD & custom
DigitalOcean has a control panel that's intuitive and easy to use, new servers (Droplets) can be spun up in under a minute and they offer stock "apps" (LAMP, RoR, Wordpress) that can be deployed instantly. There's also an extensive documentation for people new to VPS.
Con No DDoS protection
When Digital Ocean detects what they think may be a DoS attack, they will cut traffic to the droplet to avoid performance drops to neighbors etc. This means if your droplet comes under attack, or appears to be under attack, it will be disconnected from the network, effectively down.
Out of Date Pros + Cons
Con No load balancing solution yet
Work on load balancing was announced January 11th, 2015. Digital Ocean now offers "floating" IP addresses that can be bound to any droplet in the same datacenter. Otherwise, load balancing is often implemented by the user on a droplet via haproxy / nginx / etc.