I had no problems boiling water with this rocket stove; 8 cups took about 15 minutes from fire start. I also had no problems browning hamburger in this rocket stove. Both done using a Walmart camp oven. I feel that you can cook on relatively low heat, but you can also crank up the heat when you need to. For both cooks, the stove used very little fuel - as expected. This is all perfect in my book.To do low temp cooking I fed the sticks in from the bottom of the "J" and when I wanted to blast the heat to boil the water I put the sticks in vertically from the top of the "J".Some difficulties I did notice when using this stove, it is pretty easy to clog up the air flow and kill the flame, you need to be mindful of that and may need to use a stick to move some embers around every once in a while / remove some embers with a metal tool, maybe. If you are only cooking for a very short time this probably won't be a big issue, though.The other thing is the ashes / red hot embers leak out through the air vent in the bottom, you have to put this on something that is fire safe, like a patio stone maybe, something like that and still be mindful of what your embers are doing.Mine did come with all the parts it should have, but on one of the legs the thumbscrew won't go all the way in to hold the leg tight. This should be a simple fix when I get around to it. It's not a bother to me right now, though.I suppose it's not perfect, but it does what it's supposed to do relatively easily. I am very confident giving the Bruntmor Camping Gear Rocket Stove 5 stars.