I don't know anything about the Napoleon. There seems to be a good number of users here, and I don't recall any horror stories. Regarding convection, I have the rear heat shield on the FV, and it makes a nice convection tunnel. I get a good amount of hot air shooting up off of the back of the stove, like a couple of hair dryers blowing.

Regarding fragility, like BAR said, the FV is approved up to 700F stovetop, and, IME, you would have to work at it to hit 700F, like do a hot reload with superdry wood. I haven't seen mine go much over 600F.
The only incident of 700+ in a FV that I recall having read about was by Dennis, and, well, he has magic wood. . . p.s. his stove didn't crack up. Regarding $, for $100 more, I'd be giving the new Woodstock further consideration. . .or pick up something cheap on CL to run this season and get a FV refurb in the spring for ~ $1500. Woohoo!