like becky, i have a misto and am very pleased with it. i have two, one
with flavored olive oil and one with plain. fifteen or so strokes of
the pump seem to last me for quite a few spray sessions of 2 or 3
seconds each, so unless you're spraying a large baking dish or skillet,
rapid loss of pressure shouldn't be a problem. i can't compare it to
other oil sprayers as misto is the only one i've run across so far.
misto has a website, if you're interested:
one thing to be aware of: the plastic tube part of the pump has a tiny
slit in its rim (apparently this is part of the functional design) that,
if the misto is pumped too vigorously, can crack, making it impossible
to build pressure. i emailed misto from their website when this
happened to mine; they responded promptly and (in just a couple of
days!) sent me a replacement tube at no charge. i'm now more careful
not to get carried away when i'm recharging pressure.
disclaimer: i have no affiliation with misto, etc.--just a satisfied