What an amazing little stove! Don't let the reviews fool you. Yes this stove comes out of the box ready to incinerate everything, but a small hack/fix that I found online resolved that issue in less that 5 minutes. (Just do a search for "how to get a low flame with Coleman FyreKnight Hyperflame propane stove" - different model, same fix). This fix involved pulling out the valves and cleaning the "gunk" that Coleman uses at the factory, and spraying a silicone spray to keep the lubrication of the o-rings. This fox gave me much better flame control. I was able to establish and maintain a low flame that was barely visible, to a blazing inferno. It should be noted that the knob/valve essentially have a range of operation of less that 90°, meaning once you've reach maximum flow, you can turn the knob over 2 or 3 times and not have any effect on the flame. So the flame adjustments are small and president, but after the fix, it works great.
This took me less than 5 minutes and immediately resolved the issue of the lack of flame control.
Now back to the stove.
#1 - READ THE INSTRUCTIONS! If you start pulling on things without knowing how to release them, YOU WILL BREAK SOMETHING!
The extendable legs are pretty good. I would have liked them to come up just a bit higher, but as they are, it's not that bad. The legs have little adjustable feet to help make things level. The legs attach by simply screwing he end of the leg to the bottom of the stove. They store securely at the bottom of the stove, so you don't have to worry about losing one while travelling.
The legs are pretty stable but one thing you have the watch for is they stick out a bit and it's easy to be walking by/around the stove and trip (launching food hot food from the stove). I'd give the extendable legs a 8.5/10.
Now to the "grills". The grills are basically a reservoir that holds water at the bottom, and a grill covering it. The idea behind this is that the grease from burgers, steaks etc (I do not recommend cooking bacon on the grills, I purchased a grill top - sold separately), gets trapped in the water to reduce flare-ups. I haven't used this feature yet, but I will update the review once I have.
The grill assembly is sturdy and sits right over top of the stoves burners. (You have to remove the stainless steel burner covers/wind guards). The grills don't "lock" in place like the burner covers/windguards, but while testing the assembly, they seems to stay in place under some light bumping of the stove. You can use both, or only one at a time to meet your cooking needs. My initial rating for the grills: 8.5/10
***UPDATE*** After using the grills, I am a bit disappointed. (Docked 1 star to general score) while the concept is great, and the water reservoir did it's job avoiding flare-ups, the grill is essentially one big hot spot in the middle.
I tried grilling 2 burger patties on each grill. The part of the burgers that were on the middle part of the grill got charred, while the other part of the patties were "cooked" but with very minimal grill marks, meaning that the heat distribution is not great.
Throughout the process, there were no flare-ups at all, unlike the last time I grilled burgers on another camp stove. So at least that part worked. Unfortunately, only the part of the burgers that were over he center of the grill were really cooked well.
Maybe the grills would work well with only one burger each, but I didn't try, I removed the grills and installed my flat top griddle and used that to finish cooking the burgers. Updated rating for the grills - 6/10. Great concept, poor performance.
Now to the burners/covers/windguards. The burners covers snap in place, insuring that the pots/pans used stay where they need to be. This also blocks out a considerable amount of wind and helps direct the heat upwards to the pot/pan/kettle etc.
I was blown away at how fast I was able to boil approximately 2 cups of water in my camping kettle. I didn't time it, but I would be comfortable saying it was under 3 minutes. (I set the kettle on the stove and began prepping my grilled cheese sandwich, I heard the kettle "popping" and check and the water was already boiling!)
Now for the build and finish of the stove. I love the bright red! The body of the stove is nice and solid. The stove is a bit heavier than my other Coleman camp grill, but it's also considerably larger. This stove will easily accomodate a 10-12" cast iron pan or pot.
The one negative I have is the latch. It does the job keeping the stove lid closed, but it feel cheap and rattly. My much older and cheaper Coleman stove has a much better, sturdier feeling latch. I would rate the body of the stove a 8/10.
Out of the box the flame control of this stove (as with many Coleman stoves) is atrocious, but a quick fix resolved the issue and this is now my favorite, most versatile camping stove! Well worth the price.