I have been using a Garmin Forerunner 205 and would like to add cadence.
Apparently the 205 does not support cadence.
GPS is nice but not necessary since there are sites like ridewithgps that do the same thing.
Also keeping it charged is a pain.
So I am looking for a computer that can tell me the following:

Speed, cadence, distance.

Nice to have but not required:

altitude
wearable on wrist or bars

Also desired:

Long battery life
durable
no wires

310xt

http://www.dcrainmaker.com/2009/09/garm ... eview.html

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2013 Wilier Cento1 SR || 2009 Ridley Crossbow || 2011 Yeti AS-R 5 Carbon

I had an Garmin Edge 305 that died. I got the 500 which is everything the 305 was supposed to be. I like the gps because it traces my route onto the map so I don't have to remember it. Battery life is about 3 or 4 times the 305 and is a smaller unit. I have the HR and cadence I took from my old unit to save money.

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"Really fast people are frustrating, but they make you faster. When you get faster, you might frustrate someone else."

2009 Trek Madone 5.5 Project One SRAM Force 16.4 lbs w/pedals and cages.
2007 Bianchi 928 Carbon Lugged- SRAM Rival-17 lbs.

I really like my Edge 800. Good battery life, cadence, heart rate, power and maps.

Very customizable.

...neither the 500 or 800 wear very well on the wrist...

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2013 Wilier Cento1 SR || 2009 Ridley Crossbow || 2011 Yeti AS-R 5 Carbon

I didn't read it as both wrist and bars, I read it as worst or bars...one or the other.

VDO Z1 or Z3 with cadence add on might be what you're looking for. I have the Z3 and the battery life is more than a year. I haven't tried the wrist strap that comes with it so not sure if that'll work how you like. It's a little expensive though.

I was thinking about it, and although this might make you chuckle, you could actually wear either the 500 or 800 on your wrist quite easily...using the supplied mount!