I like its ability to measure and store split times. I tend to ride the same course and measure my performance at several Splits or stages along the way. Its weight is no serious compromise, but it's not made any more.
I would buy the Cateye Mity 2. It's small, light has every resonable feature people should look for, they are dirt cheap and I can't remember the last time one was returned to us un-wirking for any reason. Their Japanese quality absolutely surpasses all of their competitors. (all of them). They have been making computers for 14 years and replacements and spare parts have always been available, which can't be said for any of their competitors.