I've done a little research on this site and a few others in the last few minutes and have come to the conclusion, that, on most modern 4- and 6-cylinder engines, the harmonic damper is just not as important as it was on older engines (especially older V8s).
I would put using a non-damped crank pulley in the same class as using the 7AT for minor deceleration - it's not the best thing to do as far as longevity goes, but it's not all that bad, either. For a lot of ppl the small loss in longevity is more than made up for by the gain in fun.
For a DD that seldom gets near the redline, I'd be comfortable running without a damper. For an engine that will see a lot of high RPM use, I'd want some kind of damper on there.
YMMV.
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