I have used most and went without for over a year.
I like the wired best for being accurate and reliable (unless you break the wires).
Cateye Astrale with cadence is the best I've used for many years. One is so old that little contacts were worn off under the head. If it rains put a plastic bag over it. Batteries last a long time, so long I can't remember. At least 1 to 2 seasons of 5,000 to 6,000 miles.
Garmin-I have the Edge 500. It sucks for the most part. It is a HR monitor and cadence. Speed is not real accurate, elevation is way off even if you use the set points. It tells the current temperature and everything you don't need to know. If you put it on a bike with no monitors, it even sucks more as speed will vary up to 3 mph in 10 ft.
Garmin has sent me 3 replacements in the past 6 months. The tech support can be good or bad. I was so pissed at one tech fellow I was going to give the unit away. I did find on tech fellow that acted like a human and asked enough questions to understand what was going on. All techs were very quick to tell me that the accuracy was not very good.
I use the Garmin to switch bikes. You need the hook ups or accuracy is very poor. They are not worth the money. Probably a HR monitor and cadence would be enough.
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