These very powerful 15x binoculars are designed to perform best at long range where they are able to deliver a highly detailed image.
The use of large 56mm lenses does make them a bigger and heavier instrument than your standard 42mm binocular, but the advantage is they are able to capture more light and so despite the very high 15x magnification, these binoculars are able to deliver a bright, high-quality view in all but the worst light conditions.
So whilst the large lenses on these Yukon Point binoculars are able to counter one of the main drawbacks to having a very high power, they cannot prevent image shake. So even though these are hand-holdable, to get the steadiest and thus best views possible, it is recommended that you mount the binocular onto a tripod. Yukon optics make this easy as these binoculars are tripod adaptable as they have a thread on the front of the hinge that will accept a standard tripod adapter.
Another disadvantage of the very high 15x magnification is that whilst you get a highly detailed image, your field of view is greatly restricted and thus makes this particular Yukon binocular not the ideal choice for following fast and erratic moving objects at closer ranges.
Further evidence of this not being an ideal binocular for close range can be seen by the fact that they have a relatively long 3.5 meter minimum focus distance.