I would like to see a further review on the accuracy of the meter. I question what kind of quality you are getting for $250+. Perhaps it's better than I think it is, I just don't know.
I can't speak specifically for the circuit in this tuner however...
I have an Ameritron manual tuner (Ameritron is owned by MFJ). It's a peak reading meter and seems to be reasonably good. I wouldn't be surprised if they use the same circuit design, but I haven't looked at them, either (and probably wouldn't know what I was looking at, LOL). I can't say as a percentage how accurate it is because I don't find that in the specs. All I can say that my tuner's meter is "reasonable" when compared to my other meters.