I have a CB edge 550. It is my first boiler and it is the gasification model. I am nothing but pleased with the way it performs. I have set my thermostat at 72 and not adjusted it whether it is -10 or 30. It took a little bit to learn but nothing that was earth shattering. My house is a little over 5000 square feet but I have the vents shut off in about half of it. I'm heating through my forced air furnace plenum.
I fill it every 12-14 hours. Open the door and run the rod through the coals and keep the air exchanger pass way open. Fill it and walk away. My maintenance is about 10 minutes once a week clearing the ash. I've been burning for just about two months and I am up to about 2 cord of wood. Most of my wood is not primo. I have been burning a mixed batch of elm, ash, box elder, and a little pine, oak, and maple. Some is a little wet and I can tell as my temps are not as high.
I looked at other brands and decided to go with the CB because of price and the dealer is 20 minutes from house. I couldn't be happier so far.
Should have added that the boiler is a super simple design. Nothing earth shattering.