shape stealer +1/+1 counter

[joshisme]

if you have a shape stealer with +1/+1 counters on it, and it copies power and toughness of attacking or blocking creature, do the counters affect the power and toughness after the effect resolves or are they overridden?

[yggdrasil]

if you have a shape stealer with +1/+1 counters on it, and it copies power and toughness of attacking or blocking creature, do the counters affect the power and toughness after the effect resolves or are they overridden?
The effect from Shape Stealers ability applies in Layer 6b, counters in 6c, so they always get applied after the P/T-setting-ability.