In general, the smaller the objective lenses, the more 10x binoculars suck. This is due to the diffraction of the objective-lens edges, which in higher-X binoculars are a larger proportion of the area of the objective lenses.
One extreme example occurred a while back, when an outfitter friend of mine was given a 10x25 "alpha" binocular by a client. He was really proud of them--until I showed up with a "test" binocular, a 10x40 that retailed for about a 10th the price of his tip-binocular. We could both see more detail in the 10x40 than the 10x25.
In fact, I have yet to see an "alpha" 10x30 binocular that provides as much detail as an 8x30 of the same make. Then there's the problem of holding tiny 10x binoculars steady enough.
In general, 6x to 8x "pocket" binoculars work better than 10x models.
