I have used mine for 3 years and I love it. I payed $700 for a log truck load this year and last. Always have plenty of wood left over. If you know how to use your stove, you won't be smoking out your neighbors. Most of the problems come from older stoves or stupid people that burn garbage. I'm sure some of the heat goes up the chimney, but I have my house temp between 72 - 76, depending on the wife
I also get 12 plus hours of burn time, so I am not comstantly having to fill the stove or plan my day around the stove. If that is considered in-efficient, then I'll still take it.
When they make a gasifier with a longer burn time or that doesn't have everyone running out putting in storage tanks the size of your car, then maybe I will consider one, but I don't see it happening. I also don't have to worry so much about making toothpicks out of logs so they will fit in the stoves burner.