I had an 2 burner alcohol stove on our Hunter 25, Once we cleaned it up it worked fine. I got to like it a lot and since I only needed a cheap can of alcohol from Walmart for fuel and never had any issues. It can flare up if you put too much fuel in the bowl but that will go down immediately once the fuel is burned - its not going to burn the boat up!!
Lighting them does take a little getting used to but once you have the technique down, its simple and easy to get going. I never had any concerns about safety other than to keep a window open for fresh air - I do this with any stove in a confined space.
For me, I liked it, since I had other places to put the boat bucks instead of a new stove.
Fair Winds,
Victor