Personally, when I am using just 100-125mg test prop per week
I feel the best..slight euphoria, but nothing like taking MDMA etc.
Just a general sense of well being, even energy, great libido.
Blast amounts (500mg+per week) can actually work backwards in the
euphoria/feel good dept.
500mg of test per week vs 100mg requires more AI,
but generally not 5x as much. You can get a little lost in
the process your first time through, and you should get blood work done
after your 3rd-4th week to double check that your E2 is at an acceptable level
With blast sized dosages, side effects are more likely to appear as well.
Here is an old thread that talks about the feeling of being "ON," and what each poster
felt was the best experience.