I started using Digital Ocean with a small project a few months ago just to play around. I've been very pleased and am in the (long) process of moving all my sites there. I have a $5 droplet for some personal stuff and I'm putting my main sites onto a $20 droplet. That's probably more than I need, but considering I'm currently spending $65/month, it's a significant savings.
I don't use ServerPilot because I'm comfortable with command-line stuff. In fact, I really like that aspect. Trying to go through cPanel or other hosting interfaces to figure out how to do stuff was always annoying. I've created my sites as Git repositories, so I don't use any graphical interfaces to interact with my server, which is preferred, really.
Between the SSD drives and not having all that other...crap, the performance is really strong. When I move larryullman.com there, I expect to use HHVM, which should make performance even better.
As for having multiple droplets around the world, I don't think...DO supports that out of the box. In fact, I think many load balancing like things have to be on droplets within the same region. But you could easily use DO with AWS as a CDN, serving static assets from even more sites around the world. On LarryUllman.com, serving static assets via AWS as a CDN cost me, at most, $4/month.