Yes I think it's a pretty accurate device based on my experience-

It was able to identify food sensitivities , pathogens, and nutrients that helps balance various meridians (things my body didnt enjoy like eggs/porks and things my body craved like specific vegetables/dairy)

I rely heavily on what it tells me when taking supplements - It was also able to even guess my favorite color, and even letting me know I was grieving BEFORE I found that one my friends had passed away recently.

Drawback is that is very time dependent, meaning that the readings will change as you tweak whatever protocol youre in (for example loading on a specific mineral due to deficiency), so it's good to do readings once in a while as to not overdose in a supplement. (For example I was taking lots of aminoacids a few months ago and was feeling great (EAV showed lot of benefit) - but now I need to stop taking them as they will stress my liver).
Another fault is that it will tell you what nutritients (and forms) may be very healing for you but may not address on how it gets to the site).
For example EAV identified a parasympathetic diet for me (higher protein) which I enjoy but since I was low in stomach acid and enzymes I couldnt benefit from it; EAV later identified the benefits of supplemental digestive enzymes/HCl for the diet. A well rounded reading will provide you good hints but may be a little tedious.
My dentist also uses it to check for heavy metals/pathogens/chemicals on several teeth meridians to tweak the chelation protocol I was in.

It should be used as a tool to double check what your body is telling you.

Mike