I remember him having to retract one of his stories (was it the car park story?), but I think that his overall hit ratio is pretty decent. When he broke the story about the tiara which got the ball rolling on the negative Meghan stories, he was over-the-top with his negative view of Meghan and my take away is that you have to read his stuff with a critical eye, but I for one think that he has good sources. Bear in mind that a top-notch source may feed false information in order to further their own agenda.
A stop clock is right twice a day. We have no idea if the tiaras story is right and I doubt it is. How could Meghan want one they were unlikely to have shown here. I mean they have loads. Unless of course what she wanted was Eugenie's one and that had been earmarked. The one Eugenie wore is quite a known one.