To be fair, you probably have an ingrained "normal continental/ebh grip serve", always hard to break a old "habit"

I'll go on a limb saying, that the efh grip serve must be hit below a certain racquet head speed

kinda like training wheels on a bike... not recommended above certain speeds.
Slightly serious question to folks teaching... if a beginner comes to you and says, i want to learn a serve, which requires a minimal investment in time,... what do you teach them?
I'm torn between:
* underhand/sidespin serve (which is pretty effective even at the low 4.5 level)
* eastern fh grip - which allows a bit more spin than the western/frying pan serve - which IMO is effective, especially when placed consistently to the bh wing, up to the 4.0 level
The continental/ebh grip serve clearly has advantages if you want to get past a certain serving level (say 4.0), but for me, anway, has required ALOT of investment in time & practice.
Thoughts?
PS. I would only recommend the 360 spin if i didn't like the student... and i would definitely film

PPS. I lol, everytime I see the trashiest idea threads, always get the most attention (1344 comments and rising!)... kinda like junk food, or junk tv... it's like comforting to make myself feel better that someone knows less than me about <fill in topic>