I bought a Misto from Bed Bath and Beyond a few weeks ago and absolutely love it!! You just fill with any type of oil you like, pump a few times for pressure and spritz! It makes it so easy to lightly spritz veggies before roasting or spritzing a pan lightly instead of drizzling too much!
Not sure about the facts, but I've read several things about Pam being bad. I do know one of the ingredients is propellant as I looked at the can I had prior to buying my Misto. I think I will be buying another MISTO for the hubby to use on the BBQ grill too. Only cost about $10!