Strengths: Was guided to buying these after gait analysis, having tried several models from several brands. I only weigh 70kgs and have got good mileage from them so far (probably 600kms already) and reckon they have about the same left. Cushioning is great, no more knee pain. No problems with 'biting' my achillies tendon either and no blistering issues.
Weaknesses: I'd love to get more of these but the expert in my local running shop suggests that the newer model is not so good...
Overall: Very pleased - these running shoes have set me free from knee pain.