I got GUE training up through Tech One and RB80 years ago and at the time GUE training was definitely something that was different and could be found nowhere else. In my small corner of the diving world I have watched GUE training evolve along with the other agencies. The level of instructors I see now in GUE has fallen quite a long way from the original and there are many more quality instructors with other agencies now that stress team diving and other 'DIR" concepts.
GUE training is still of good quality but I don't think you can anymore take the GUE instructor card as absolute proof that you are getting a top flight instructor anymore- as they have expanded they have become alot more "average" in some locales the best instructor may be GUE but in others maybe not. You still know what you are basically getting with a GUE class - lots of team diving concepts- high stress on skills- DIR equipment configuration but this is also present now in many other instructors classes as well but you can not shop by their agency label you need to interview the instructor. As you pass the fundies/intro level the interview become even more important as this is where experience of the instructor as well as philosophy becomes a higher priority.
+1
I have seen some great GUE instructors and some who struggled. There are also alot of other high quality options out there as well since these concepts have spread beyond a "hub" of a few NACD instructors and the WKPP (some of the best of those have quit too, like Tyler Moon)
Water skills-wise, I am not sure if Tom Mount even teaches that much or when he does holds his students to a suitably high standard. At one point he retired, sold the agency and now he's back in charge. As far as academic material goes, I doubt he's teaching the same concepts that most of us would recognize as "DIR". The whole question is like asking if TDI "Intro to Tech" from Bret Gilliam would be like taking Fundies. Answer = not.
To me its pretty simple. If you liked what you saw in the GUE-F class, I would find out who was teaching, take that, and see what you get out of it.