Strengths: I've got wide feet so I've always appreciated NB width fittings. Fitted me perfectly straight away. They have a very deep toe box which I like as they don't pressurise the toes at all. Just the right combination of cushioning and control for me. I'm 6 foot 1.5 inches and about 12 stone 10lbs.
Weaknesses: I suppose they are quite expensive. Watch out for small size ratings - I am usually a size 12 but needed 12.5 (UK) for these. The deep toe box which is great for me might not suit everybody.
Overall: I had the 1222s before which I loved - did a marathon and a half in those without any problems. The 1223s feel broadly similar although I know there have been some design changes.
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