I last used it about 4 or so years ago, so of course things may have changed. It was appallingly bad though, to the point where it was no more accurate than posted schedules on the routes I rode. I just quit using it because it was so thoroughly useless. The sad thing is that it previously had worked extremely well. Glad to hear they've fixed the issues.
It pulls from the same source that Google Maps currently does, so feel free to use whichever you prefer.