Burnt ends are pretty simple, process-wise. I smoke a whole packer to I/T of around 155* in the point, then separate the point/flat, and wrap the flat (if you wish to wrap) and continue cooking to desired tenderness and I/T. Cube the point muscle to about 1-1/4" to 1-1/2", dust in more rub if you like, but I prefer just sauce. Return the cubed point to open grates until the sauce begins to caramelize nicely. It should fully cook the meat by this time and seems to give a nicer texture in the bite and chew of the burnt ends than if you cook to 180*+. My best runs so far have a light popping chew, but are quite tender and very juicy inside, and have a nice, crispness from the caramelized sauce...at least that's the way we like them the best...your preferences may vary. You can do burnt ends from a point that is cooked to 200*, then cubed, or 150*, and anywhere in between...it all changes the burnt end's texture and internal moisture. Higher temps when cubed may be drier when finished, and will have a softer texture, but at some point a grainy, mealy texture may be noticed due to over-cooking.
Just remember, higher temps when cubed means they are already cooked to a relatively tender state. Lower temps when cubed means they need extra time time to finish cooking, and this is best accomplished back on open grates, IMHO...plus, you get that crispiness on the edges that offers am extra level of texture in the bite and chew.
As already stated, yes, they are worth the extra time and effort. I smoked a packer for the family once and didn't make BEs after doing them a couple years...thought I'd never hear the end of that. I learned fast that when you smoke a brisket, you better be able to bring the BEs to table, or face the unruly masses...yep, they're that good. I also became of the opinion that a brisket smoke just isn't worth it without BEs...I now smoke brisket FOR burnt ends. BEs have got to rank in the top 10 best eating treats to pass through the smoke...maybe even the top 5 best. If only I could find a retailer that sold only the point somewhere around here...that's been a secret quest of mine for years...OOPS!!! I guess it's not a secret anymore...
Enjoy your burnt ends adventure!!!