Lightning fast mail client for OS X

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I tried it but never liked it. I returned to Apple Mail which is like an abusive relationship I can't leave.
So... basically sparrow all over again? haha
Have you tried this, @badboyboyce? I've found it hard to move away from something I'm familiar with (Gmail).
Still can't break away from Sparrow...
I just ditched sparrow for this solely because sparrow started failing to send emails on the first try from all my google apps accounts.