Any PWO with caffeine+DMAA I can guarantee you will become dependent on if you use it every session and feel like you can't train without it - happened when I ran through a whole tub of Jack3d for 6 weeks.
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This is great advice, many people find that their dose just gets bigger and bigger all while their poor old nervous system continues to take a hammering.
Having a rest from stims is a good idea, another option for people who swear by them every training session is to ensure caffeine levels from tea, coffee and anything else is kept to a minimum.
That way, at least when you do take stims pre training you will get maximum effect.