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During a Flight testing session with a new Lancair IV-- I was required to
train a retired military F-4 pilot, currently flying King Airs--15  hours. We
spent several hours in analysis of the stall characteristics, with and without
stall strips, and large and small strips.  We also calibrated the Jim Frantz
AOA instrument.
To summerize,
1. Stall strips do not reduce stall speeds.
2. Stall strips cause buffet 5-10 knots above stall speeds
3. While operating in this 5-10 knot regime, the airplane is docile and
ailerons control normally.
4. The effect of this strip on cruise performance is negligible.  Large (1/4")
or small(1/8")

All airplanes are different to some degree.  If your airplane stalls normally,
predictably, strips may be an annoyance. If your airplane always drops a wing,
and tends to tighten up in a spiral, strips would be needed and helpful.