I have a pair of 12x36's, and for $600 my favorite thing to do is bring them to 3D archery shoots where guys are trying to see if arrows cut scoring lines on bland colored foam animals. Many have all the top binoculars usually 12x and when squadding the same thing happens, someone will notice my "odd" looking binoculars and they will ask to look through them. They do, they press the button and their jaw just drops. Even if you use your bow for a rest or lean against a tree it's night and day. I've owned all the big name binocs over the last 20 years EL's, Zeiss, HD-B's and if you have to hand hold them even at 10x, even sitting resting on your knees, and pick out detail like reading text, seeing scoring lines etc. these the stabilized binoculars simply provide a better view, the stabilization works and works well. It's like shooting a $10,000 rifle offhand vs $2000 rifle prone, doesn't matter how good the rifle is, it won't make up for the movement. Now if you tripod mount them, the big names with awesome glass crush the Canon's, it's not even a contest.
What I wish is that some higher end companies like Leica, Swarovski, Zeiss etc. would do something like this (well technical Zeiss has a 20x60 stabilized set but they are $10k+ and super heavy we used to use them for work) because the Canon's have a lot of issues. First most are not waterproof, in fact only the 10x42 L's are. Second the glass on most is not great, nor are the ergonomics. Also you get a 3 year warranty and if something goes wrong after that, Canon charges so much for the repair you might as well buy a new set. Also there's a lot of sample to sample variation, many of them exhibit focus "shift" when stabilizing. It's usually subtle but canon insists it should not be there. My set had to go in to address this when new, and came back perfect, but a lot of people report it.
As to the 15/18x models I've heard others say that the 18x is approaching the limit of the stabilization off-hand. I've also heard the new 10/12/14x32 models that are pretty expensive have been overall disappointing for the price. The 15x50 model seems to be the one people fall in love with. Some of the astronomy sites have tons of info on these as they seem to be one of the largest groups using them.
You also want to know your use case, some brands stabilization is better suited to large movement, such as on a boat, etc. others are better suited to the tiny vibrations trying to hold them still while you are not moving. I've never used them but I hear the Fuji and Nikon's are much better for boat/ship use where you are moving, as they have a larger arc of image damping, but they don't do as well damping the tremors standing still holding them as the Canon.
