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first off, sf6 stands for sodium hexafloride gas which is inert, Siemens did some stuff in a 500kv switchyard I worked in and with a SF6 breaker the air gap is about 6 inches and the switch size is measured in inches, compared to the "old" air breakers that are huge (larger than your garage) and sounded like a cannon going off when they opened. With SF6 your switchyards and main disconnects can be very unobtrusive at a time when substations are NIMBY. My experience with them was fine although much closer tolerances are required(mm not inches)
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