I replace my bulbs when they burn out, so I don't have the domino effect predicted above. Reactor's strings probably have fuses in the plugs like mine do, and like all fuses, they're designed to protect the wiring. By the way, I love my prelit tree, it looks awesome and is easy to keep functioning if you apply a little common sense.
Dish
I do too, but on two occasions I've had it happen with a short 20 or 35 light string. I wasn't in the room, but within a period of a couple hours, it cascaded until every bulb in the string was blown, about half of them were blackened significantly and several had open shunts. I guess it's not that surprising since all the bulbs had the same hours on them and once one failed the others ran hotter and so on.
That said, no harm was done, and I've still yet to see a string with a safety bulb in the first place so by putting a normal bulb in there you're no worse off than someone using an older string without that feature.
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