We had an Orego alcohol stove on our boat where we lived for eight years.
For the plusses, we found it maintenance free and easy to use. It was a simole task to fill the canisters and the gallon jugs ( or smaller ) were easy to store on the boat. A gallon usually lasted about a month. Thus we could haul a six month supply aboard with no problem. Bear in mind we were in the boonies for three months sometimes. ( no propane
refills ). There were instances where we could get denatured alcohol when propane
was not available. Also the initial cost is low and the installation quite simple.
On the down side, when the stove was on for a long time and it got really hot, the regulator would sometimes warp and thus not turn the burner completely off. Then we would lift the lid and smother it with a damp towel. This did not happen often, but was a slight pain in the giggy nevertheless.
Cost wise we figured that the alcohol we burned was about equal in cost with what propane
we would have used. This is difficult to compare though because as we cruised to different countrys the cost and availability of alcohol varied by a large degree.
This type stove does not require pre heating nor does it used the fuel under pressure. I would say that it's about as safe as you can get and still have fire.
I would not use one in a camper as the propane is required for other purposes and I would have it aboard anyway.