Strengths: Light, comfortable feel make them instill the feeling of a racing shoe.
Weaknesses: Being very picky now, but if you remove the insole and wear them (as I do) with a half shoe orthotic, the area under the toes can feel a bit uneven, this feeling goes when you start to run.
Overall: Fast responsive ride for heavier runners (I'm usually about 13.5 St) Very stable, comfortable fit even with the prescribed orthotics I need to wear in concert with a stable shoe. I have worn these to race in half-marathons, but trained in longer distances. I prefer these to the other shoes I wear, the NB1221 and 854, and even the Asics Gel Kayano which I've run marathons in. Excellent value shoe too!