These pairs are my current line up (January 2013)
Training: old model NB480 - comfortable
Bike and Trail: NB310 - light and trail ready
Race: NB 1400 - super light
Cycling Shoes: Specialized - wore on 2 races then never tried using it again... but coupled with my Look Keo Max pedals I noticed a big improvement in speed when going uphill... I'm just 'not comfy' (afraid) going clipless at this point
These shoes are great for their specific purpose but my feet's soles are way too thin and running fast is always a problem (blisters). I'm still happily looking forward to my first long run hopefully when I get a pair of NB1090v2.