I have tested several ranking checkers and theirs is one of the best. I'd like also like to check Yandex and Baidu but I guess that you cannot have it all.
Just like the other ranking checkers this is a subscriptions service but there are no long-term commitments and you can cancel at any time (which is a plus compared to others out there).
SP gets a thumbs up from me. Check it out if you're looking for a good ranking checker.