No science in this answer, but: I am one guy working in a 25 x 25 shop. I have watched how much sawdust I can create with one arm or for that matter how much VOC I can release with one open can of varnish and I just don't think that I have much explosion risk. Still I am not going with open flame in my basement shop. I think I am tempting fate enough with an electric unit (and there's the carbon monixide). Also consider what happens if the bag comes off your dust collection system blowing sawdust every where, or if you spill that can of mineral spirits. (Come to think of it, might be nice to have an emergency shut off for the heat). I don't think Jim DaddyO has an electric option.
Really depends on what the actual tool is. For example, five years later all my Ryobis are working well. There's only so many outlets that do long-term tests of things, and usually they are reserved for vehicles.