So, my Key Lime is ready. Can't remember who it was that wanted to know what it was like with shots. 
I usually get my 50/50 juices with two shots, and I love 
vaping lime in all its forms, so I gave it a go.
Key Lime, 50/50, two shots: First of all, it's definitely Key Lime, not regular lime. I'm fine with that because I like both, but if you don't like key limes, you've never had a key lime, or you don't know the difference between a key lime and a regular lime, order with caution.
It arrived clear and was ready when it turned a light pinkish color. Took about a week to steep (plus hot water bath), and will probably be a little smoother in another week, but the flavor is good now.
So, as to flavor - it is *strong* and *tart* - like biting into a key lime. Vapor isn't bad, but it's not great either... slightly below average for a 50/50 MBV 
juice. It handles high voltage well, but there's no flavor change across voltages... just stronger flavor at higher voltage, as usual. It has only a bare edge of sweetness; definitely not a sweet vape. It mixes well with other juices, but only if used *very* sparingly - otherwise the key lime takes over everything. 
When I get it again (and I will, I quite like it), I'll probably go with one shot. Two shots isn't too strong for me - I'll happily vape the whole bottle dry within the next month or two - but, like Root Beer, this flavor is strong enough on its own for two shots to be a potential "burn out your tastebuds" situation if you're planning to sit and vape it for a while. Even if you like strong flavors, one shot should be plenty.
Hope that's helpful for someone.