If you cook with olive oil often (say that three times fast), you need a Misto.
I grill (in the summer) and roast (in the winter) vegetables almost every day, and the Misto has been invaluable to add a little olive oil to the veg of the day.
Pump the cap several times and you've primed the pressurized sprayer, hit the nozzle and out comes a fine mist of oil.
But, 1t olive oil = 1 Points+, how do I determine how much I use and how do I count it if the oil is projected in a mist? OK, here's a secret: No idea and I don't.
I know, I know. And I count everything else, but since it's just a quick hit of oil, I let it slide. I've been using it for months and it hasn't shown up on the scale, so I think it's OK.
The Misto has been an incredibly valuable addition to my kitchen gear, right up there with my food scale when it comes to daily use. If you're a regular olive oil user and you want to go light, definitely get one.