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Sorry this reply has taken so long. The notifications are going to an email address I no longer use.
The plugs on the EX500 motor aren't sealed off from the outside via the plug wire/caps like they are on the 250 motor. There are actually little drain holes in the head to let water make its way out from around the base of the plugs. That being said, the 650 coils are just long enough to clear the top of the 500's CAM cover, but there are no seals at the top. The rubber boot at the bottom does fit snugly around the 500's plug, so there is no danger of their falling off.
To your other question, so far they have been running great. Back when I was running the 250 motor, whenever I road in the rain and went through large puddles, the engine would try to die probably due to old crappy plug wires. I don't have that problem anymore ... no more plug wires.
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