Expect biased polarized feedback.
It's a highly efficient water boiler, for singles and large groups.
The neoprene is a nice "cozy" to keep your hands from burning.
It's heavy, expensive and bulky by BPL community UL standards.
It's tough to clean for people that cook sauces and oils.
Many complaints on the piezo igniter breaking, and since this product is popular with newbies, they typically don't have a plan B lighter or match.
The dummy flag signalling that the water is now hot, was received as a cool feature by gadgeteers, and an insult by seasoned trail masters: "if you can't tell when water is boiling, and that boiling water is hot, you have no business going into the wilderness"
I REALLY REALLY wanted one. Didn't need one. but WANTED one.
I obssessed about it for about 2 years with the REI discounts and the ones for sale on this forum. Eventually the "gotta have it" consumer drive passed. Glad I did.
As with most gadgets, a person can start with the system analysis of requirements gathering. What is the goal you are after? since you are on this website, apparently weight, cost and functionality is primary, Lexus bragging status is null.
I'm not knocking the JB, I'm OK most of the time without a stove, and for winter I'm OK with a cheap $8 JOGR iso-pro off amazon, in a 750ml Ti kettle pot or the IMUSA walmart mug.
Many here have a cook setup that are even lighter, much more efficient, and cheaper than mine when they get into the MYOG soda can fuel stove and reflectix cozy.
The JB stove only works with the JB mug, and other JB products such as the JB frying pans. It's not interchangeable with another product. They are made to fit with each other, to achieve that heat optimal combo.
CORRECTION: Per Hikin Jim's blog, if you buy a JB adapter to JB stove, you can use non-JB pots and pans.
This next paragraph is not unique to JB, but it's a big pain for JB users. When the JB pot with soup or sauces boils over, the spill over gunks up the fins on the JB stove and it doesnt work any more and takes a lot of time to clean it.
In reality, if they boiled only water, then took the mug off-line and added the soup sauces, the mug would not have over boiled. So it's really the user error. but since JB attracts the newbie demographic, and newbies make mistakes, newbies blame the product.