Something I've noticed from long, long hours of watching Star Wars is that there are at least three distinct "voices" of a lightsaber, most noticable when they ignite. There's the "old school" sound, the "sith hiss" sound, and the "new snarl." I know this isn't terribly helpful in describing them, so I'll associate voices with sabers:
Old school: Luke ANH, Anakin ROTS
Sith Hiss: Darth Sidious ROTS, Darth Tyranus ROTS.
New Snarl: Luke ROTJ

Does anyone else notice this, and if so, does the "voice" of your saber matter to you?

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