These binoculars are spectacular. Point them at Jupiter and you see a bright dot wandering around in the field of view. Press the image stabilization switch and the planet and its moons instantly become visible. While they can't subtract all movement they do get rid of the little shakes that make hand held viewing so difficult. 15x is enough magnification that Saturn is obviously not round.
A complaint about earier versions of the Canon IS line was that your finger went to sleep holding the IS switch down. Now you can press it briefly to turn on the IS circuitry which will automatically shut off in 5 minutes. If you press and hold the switch it shuts off as soon as you release it.
I haven't had my pair long enough to comment on battery life but do see a problem changing them when they are mounted on a tripod. Unlike most binoculars where the tripod mounting is at the objective end where the two barrels rotate on the Canons it is at the bottom of the binocular near the center of the tubes which don't rotate. And the battery compartment is just in front of it so you can't get to it if the binoculars are on a tripod of have a quick release plate attached.
Since the lens barrels don't rotate intra-ocular distance is adjusted by actually moving the oculars. They are kind of stiff but that is good because they stay in place once you get them set.
The tripod mount is lower than the highest part of the lens barrels so if you have a big quick release plate like that of the Manfrotto (Bogen) 410 geared head (highly recommended) it presses against the bottom of the barrels and not the flat between them.
For some reason Canon doesn't seem to fell that the objective lenses need any protection as they don't ship lens covers for them. They do provide lens covers for the oculars but they pop off a lot because the eye cups are so soft. It looks like you need something like 69mm lens caps. They don't tell you in the manual but Canon sales says they are threaded to accept 58mm filters so you can buy solar filters for them.
I can use the binoculars with my glasses on due to the 15 mm eye relief but it is really easier to use them without the glasses.
They are heavy, ~2,5#, but if you support them on the heels of your hands very stable.
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