GUE divers, in my experience, are rock solid. Some of the best if not "the best" taken as a group in their fundamentals. However, one downside of the GUE/DIR philosophy is missing the forest for the trees. There are absolutely times when rock solid skills are called for and immensely helpful if not critical. However, outside of technical diving (cave, wreck penetration, deco) there are many instances where "letting your hair down" is not only warranted but helpful. If I were to get hung up on rock solid horizontal trim at ALL TIMES I would miss a good bit of the marine life I see on every dive. Sometimes I have to go heads down, sometimes maybe roll over to look up, sometimes go somewhat vertical to scan the reef for cool critters I may be missing, sometimes go perfectly vertical in mid water on ascent to scan for boats, dolphins, sailfish, swimming crabs, etc., etc.. I'd encourage you to work hard to maintain what I'm sure are intensely solid skills, but also be willing to let yourself deviate from them when the environment and the situation warrants it.