I also have the 305 and love it. I think I paid 150 at Costco. It is absolutely great for tracking my progress on my average speed, my heartrate, how far I have travelled, etc. I have been doing interval training a lot more and only as far as 4-5 miles instead of distance training and the 305 helps me with my speeds (mins per mile) and heart rate zones. I run hard for 1 min then slower for 2 min then fast again for 1 etc and I can see the graphs of everything I did when I am done. I get a little over-analytical but I like to see if I am actually improving or not.
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