Oh... I heard something about 21 of April - in Boston marathon, but probably it's not true anymore..
Thanks for comparison list.
This is a thing to worry about I guess:
"The accuracy is very similar to that of the 305. There may be a slight difference due to the size, but it shouldn?t be noticeable"
whole Q&A page
here
+ there should be some bugs as it is a new product...
305 looks like a better option for the next 6-12 months for ~200$