Here's the difference in the uncompressed size of the meek-client binary.
go1.2
go1.3
go1.2 -s
go1.3 -s
linux32
6,574,768\(−0)
5,105,304\(−1,469,464)
3,188,288\(−3,386,480)
3,578,368\(−2,996,400)
linux64
7,918,328\(−0)
6,332,256\(−1,586,072)
4,027,456\(−3,890,872)
4,539,616\(−3,378,712)
mac
6,502,636\(−0)
5,053,240\(−1,449,396)
5,388,524\(−1,114,112)
5,053,240\(−1,449,396)
windows
6,075,392\(−0)
5,192,192\(−883,200)
3,223,040\(−2,852,352)
3,611,136\(−2,464,256)
go1.2 with -s has the biggest savings. go1.3 with -s doesn't save quite as much, but still better than either version without -s. For whatever reason, -s didn't seem to have an effect on mac with go1.3.