I went from natural gas to propane when I moved 3yrs ago. Price varies and I can't really tell you anything in that regard other than it seems comparable to me.

I have propane heat, hot water, oven and it works just as well as my natural gas did at my last place.

You just have to keep an eye on the tank. During cold winters you can burn through 500 gal in just over a month if you are not careful. But during a warm summer your tank could easily last 3-4 months.

We've run out a few times and it's not a big deal. They can usually have a truck out the next day - but may charge an extra fee.

The hard part is not having a regular bill. In the summer you get used to not having a big propane payment, then by the time Thanksgiving and Christmas comes around, and you are on your second full tank running 500-600 bucks, it can put a dent in your budget if you don't plan for it...