I really want one, the 305 is less than £100 on amazon right now. I started running a month ago on the c25k programme and discovered I LOVE running! I am doing my first race in October. Currently I am using a gps app on my phone (Run keeper). I want something tha monitors heart rate which the 305 does, but do I really need. garmin? Is it much better than the apps? I want to need it so convince me!