Well that gives a guy some hope. Still though, If you leave a 660 and the latest & greatest out in the elements for a week or 3, is that ecu saw going to fire up like that 660 will? Will months of that ruin the electronics in that new saw? It won't do any harm to the 660's guts.
Honestly, I think these electonically controlled carbs will be fantastic for the typical user. What's better than having a saw that's always perfectly tuned?
To answer your question, there's very little to this stuff, and it's all sealed. No different really than an electronic ignition coil.