Our company uses TwelveLinks for rankings of English-version of our service. UI is simple and intuitive, it’s easy to keep an eye on the process. It doesn’t take much time to start. Technical support works very well, we had a couple of issues and got help quickly.
Going global was a real challenge for us. We had to redesign business logic and adapt to local business specifics. TwelveLinks helped with targeting to US market and also we’d received lots of useful tips about running a SEO-campaign in foreign countries.