I have only used this twice, but have had pretty good success so far. I have a glass top stove and my only negative comment would be the ease of sliding of the grill/griddle.
Its maiden voyage was pancakes, and although starting out rough with sticking, my wife successfully managed to get a double batch done way quicker than even using two pans and they were pancake house perfect! Probably the best ever (using quinoa flour).
The second time around I made turkey burgers and I started the grill WAY too high, so when the coconut oil heated up, it actually smoked, which is bad for health, and a big shocker, since it's nearly impossible to burn due to its smoke point. The burgers started cooking way too quickly so I turned it down, but then I turned it down WAY too much. So they ended up taking a little longer than a BBQ and needed some care to hold and grill the sides while using tongs. But my wife said they were the best I've ever made and it's just ground turkey, no seasoning or anything.
Just remember to heat it very slowly and start it at the temp you expect to cook at. If you turn it too high, it will take forever to cool and then if you turn it down too low, it will take forever to heat back up.
Tonight I will try french toast and next week sausage. I like my french toast super-gooey and barely cooked inside so I let the bread soak for awhile and then pour lots on top and scrape the run-off up against the bread, so we'll see how this turns out. I'm nervous because it is one of my favourite things and a real treat.
I think that after getting a handle on the temp, it will be one of the best things I have in my kitchen.
I would definitely recommend, but try it out with something first when you're not trying to get your meal ready at a specific time or for company.