I have cheapie wired cyclocomputers on all my bikes, mostly whatever is on sale from the big box shops, but also two CatEyes. I use them specifically for quick distance readings (much easier to glance down than pull out a phone, which I generally also have running). Haven't paid over $15 for any of them, all generally read within 1% of my GPS. The wired eats batteries far less than the wireless (tried one wireless, didn't like it), its rare I have to change out batteries.