In my opinion the harmonic balancer looks like it is fine. Typically when balancers start to have problems the outer ring will walk off the inner ring, which is bolted solid to the crankshaft. Yours appears to be running true and isn't wobbly like some can get with partial separation. The rubber looks slightly dry, but isn't cracking horribly like a tire that has sat out in the sun for decades. I would run it, but I would give it a good inspection after every oil change.
Just my $.02