I have a 710 and it changed the way I ride for ther better. If you have a personal computer and the cash this is the way everyone will train in a few years.

I have been using it since the first of the year. It stores all of your exercises. I can look back from the previous months and actually see my progress (on these cool graphs) in endurance, length of rides, time in HR zones and many other useful and not so useful stuff.

I always wanted to keep a diary but it is alot of work. With the Polar, you just push a button, the info goes to your computer and does all the work for you.

I do not really consider it to be a "bike computer" but a training tool. The bike components are just bonus.

I do not have the power attachment, that is some really serious cash but have only heard good stuff about it.

I do have the cadence attachment. If you never have had a cadence monitor this will really clue you in. It gives you an average cadence for every ride plus the ability to see your actual cadence during any portion of the ride. I have raised my cadence from the high 80's to the middle 90's. I never would have done that without this device.

Highly recommended for someone who wants to seriously train!!!