I prefer fresh always, but heck sometimes, you just don't have a couple lemons, I agree with CG on the Minute Maid.
Now if I was freezing zest and juice in Tupperware about the size of shot glasses, well I might have been tempted to go ahead and put vodka in those and invite people over.
I like the idea of having juice and zest in little tubs.
For me, sometimes I need a squirt of lemon juice, even when I have lemons around, which is usual, so I am gonna cut one up, grab a quarter, and involve a whole lemon for a squirt I need? I am reserving my whole lemons for projects like roasted chicken.
I sincerely doubt there is a difference between concentrate and fresh in a recipe where I need a tbsp or sometimes a tsp of lemon juice amid other ingredients.
Lemons go off in two weeks, I have had a bottle of concentrate for six months.
TBS