German Arango, Mr. G. has actually been a GUE instructor for years. He has been teaching GUE there for a while, but apparently not publicizing it until recently.
I took PADI TEC 40, 45, and 50 from him there. He incorporated quite a bit of GUE philosophy and techniques into those courses which made the courses brutally rigorous, which is a good thing, as long as you are up to it.
One guy was more interested in partying out late than in his training. He must have thought he was on vacation. He didn't finish his course. Another guy didn't have his fundamental skills down properly, so he wasn't allowed to progress to the next course even though he already had a TEC 40 certification.
So, Mr. G. is the guy you want for your instructor, if you want to get serious and comprehensive TEC oriented training of any type at Buddy Dive. If you want take a higher level course from him, you had better hope that your other instructors did a good job with you.