Here goes...
I am no bino expert but,... I now have 4 pairs of binos! ....B&H has Bushnell Legend 10x42 M series on sale at $259.00, with a $50.00 rebate. Couldn't resist. Received them 8/10and have been using them in the field ever since alongside my Zen-Ray ED3 10x43s(and Theron Wapiti 10x42s!), 6 excursions. Twins, but maybe not identical twins. Yes, very bright, and clear in the sweet spot, surprisingly so. Just as are my Zens... I think the Zens have a somewhat larger sweet spot, and better edges. Still, the sweet spot on the M series is probably 75-80% of the view, and the edges are not bad at all. I will keep them. As far as I can tell, only the Alphas produce better image quality than these 2, but not by much. BTW, the M series diopter ring appears to be metal, and is very stiff. Tough to lift, and to seat. The focus wheel is very smooth, with a very small amount of play. I might add, except for the edges, where they excellent, the Therons don't quite equal the performance of the others. Still, a very good pair of bins and a steal for the price.