I used to just wait for field sprints, but if I do that now (in the 1/2's) it's usually sprinting for 6th or worse.. I still love field sprints but I need to figure out breaks now, can't ignore them anymore.
So how do you decide to go with a break or not? The factors seem to be:
a) Who's in it (people, teams)
b) How many in it
c) How early in the race is it (too early?)
d) what else do you look for?
Obviously it seems like the break with the big teams represented is the one to go with.. but many times it seems like the first few breaks are just teasers, setting things up for the 'real' break.
Also I'm racing more or less alone these days, so the other thing is that I can't just cover everything that goes b/c I'll eventually blow up; I need to be picky about which ones to go with.
I know much of it comes down to local context, e.g. the usual suspects, but excluding that what do you look for?