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Haha - I hit 50 last week and need the magnification!
The Diamondback 10x42s suffer from quite bad aberration at the edges... There are reviews that confirms. That mine are average.
I can't speak for the 8x. See the pics - same view in the centre and again at the edge. The blue margin appears from about 1/3 way from the centre, and gets worse the closer you get to the edge - especially when there is high contrast. Other than that, they are well built and sharp and for the money, not a bad buy.
Edit: PS...
I'm quite fussy about things with lenses but live on a tight budget...
The pics are from a mobile and quite heavily cropped. The actual image has much better colour definition and is sharp across almost the entire field.