I picked one of these up a couple years ago, thinking "what? no oil? nah" But I like to try new ways to cook, so I gave it a go.
I will NEVER go back to oil.  This thing makes it so easy.  The only disposal you really have to do is a drip pan in the bottom, which is infinitely easier than gallons of oil.  The turkey comes out very juicy, my whole family loves it.