I used white gas stoves for years as I was cooking for groups. They are great for that purpose, and your best bet in winter conditions. That said, I would not even consider one for a thru-hike on the AT where canisters and alcohol are readily available. The weight penalty is too great for me.
Now, if I am out with buddies for a few days and we want to do some serious feasting, white gas it is, but under those circumstances I am not really considering weight.