Donchoo, I myself enlisted early under the VEES Voluntary Early
Enlistment Scheme and therefore was an early enlistee myself, I
would like to share some things with you.
The reason why I enlisted early was because I did not do JC or Poly
in Singapore, I did a one year Matriculation Pre University course
in Sydney Australia. And after that came back to Singapore to
enlist and it had to be under the VEES cos I was still just a 17
year old kid!
I discern a few areas of concern here. One is probably if one at
such a young and tender age will be able to take the rigours of
army training and life or not. Well, if I could survive so can you!
I definitely DO NOT say that army life will be a bed of roses and
piece of cake but that even at a younger age, if one puts in the
effort and trains, one can take the training.
Another area is the maturity of the brain. I definitely acknowledge
that someone at around 22-23 years of age has an advantage in being
more mature to be able to survive in the army compared to a 17 year
old kid, However if one is willing to learn the ropes of the
military life fast and be willing to adapt fast to the environment
and the army way of life, then one can also survive well in the
environment and be as savvy as one who is older.
Remember, no matter what your ages are, you might be the younger
one, BUT all of you are fresh recruits. Your rank is the same, you
are a recruit, they are a recruit, they have NO RIGHT to push you
around and order you around, your corporals and sergeants and
officers are the ones who are your superiors NOT your fellow
recruits.
Unfortunately there might be some recruits who try to act the big
boss, do not give them face cos they have no right to do so. This
is all based on personal experience.
Well, so much for the downsides and how to overcome them, I shall
move on to the advantages, for one thing the younger you go in the
younger you ORD and leave the army and the younger you can move on
to your next stage of life. I ORDed when I was just 19! When so
many others at that age have not even enlisted yet!
One last thing, about the talk on being able to get an easier
vocation for those who early enlist I am not sure and never really
heard of such a thing. There is no guarantee about it and if anyone
else can verify such a policy please do tell.
If there is anything else you wish to know please ask! 
All the best! 
Just like to add, being an early enlistee does not mean anything
significantly different or hardly anything different in terms of
training/treatment from those who enlist upon being 18 or above who
have done JC/Poly. One will be treated the same as the other
recruits.
So life as an early enlistee will not be anything really different
from the others and my best guess it will not be anything worse
than the other enlistees.
I again state that I am not sure about that statement about early
enlistees being given easier vocations after BMT and if anyone can
verify it please do state here. 
