I was doing quite a lot of weights i pre season (for football) so upped my protein intake. Not doing much weights as training (both sport specific and running) takes up the majority of my time so I needed something to recover quickly after games/training. There is lower protein and more carbs, Im not sure if you are a 'pure' runner but this works for me. It tastes great too and think I worked out it is only about 50p a go though the tub it comes in is massive which didnt go down too well with the missus (its lie one of those 10 litre paint pots).
I was given the 305 by my OH for my birthday a couple of months ago and it is great. I was using the timex bodylink but the 305 is miles better. Cant really wear it as a watch as it is a bit big but I highliy recommend