I've only been voting by mail for 22 years but I think it's the only way to go.
I lived most of my life in Oregon which first required mail-in voting in 1998. A few years ago, I moved to the state of Washington which also had vote-by-mail. There are so many advantages to the system that it is still baffling to me that other states haven’t adopted it.
1. It’s easy. Voters don’t have to be at a designated polling place within a window of time. Weather is not an issue and clothing is optional.
2. It leads to more thoughtful voting. My wife and I sit down and go over the candidates and discuss sometimes complicated ballot measures while we vote. We use the voter’s pamphlet and research on line to better inform our choices.
3. It’s tamper proof. If you don’t trust the postal system, you can drop your ballots off at designated locations. There’s no possibility of hacked voting machines. There’s a bulletproof paper trail.
4. It’s fair to all. Regardless of employment, disabilities, distance or other impediments, everyone can vote and vote at their leisure or convenience. Voters can’t be intimidated by goons hanging around the polling places.
5. It's kind of fun. When I voted for Barack Obama in 2008, I let my two year old grandson fill in the box by Obama’s name. He wasn’t actually voting but he knew it was something important. Four years from now, he’ll be voting for real.
6. It threatens the GOP. It is probably the biggest threat to the party struggling to stay in power while representing a decreasing minority of special interests.
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Always pays to be careful. 
