I've been using the other model of this style of pedometer - the Walking Style II. At the time I bought that, this model was not available in the UK as it was being exclusively sold through an online website tied into a fitness plan.
It would appear that deal has now ended and Amazon are able to sell the unit on it's own - a far more attractive option to me as I didn't want to be tied into a subscription just to get a pedometer!
If you are not familiar with the Omron pedometers, they are different in that they use sensors rather than a pendulum to measure steps - this means the units can be put in a pocket, stuffed in a bag - basically put anywhere, and will still register steps. A traditional step counter can only be mounted on a belt or the like.
This means the results are much more accurate and reliable than a standard counter and with no moving parts, there is very little to wear out.
The Pro has all the features of the Style II - calories, steps walked, distance, clock and also remembers the last 7 days on the unit. This unit still resets automatically at midnight each day - you cannot reset the unit. The idea I think is that it's encouraging 10,000 steps a DAY - so it measures the whole day.
It's slightly longer than the Style II - to fit in the USB port I guess.
Which brings me to the biggest difference - you can connect this unit to your computer to keep track of distance walked. The unit itself will show 7 days of history, however it stores 40 days - all of which can be sent to the PC. The software is a little basic in terms of interface and method, however it works well (and on Windows 7 64-bit), keeping track of totals for days,weeks,months and years with graphs for each. You can also set a target for calories, distance, steps etc and it will let you know through smiley faces how you're doing.
This is, potentially, a bit of a gimmick, unless you really are keen to know what you've done. I'm really trying to up my steps and it's been interesting to see both when I walk the most (a definite pattern) but also to see the times where I've not moved at all through just sitting at my desk - not a good thing to be doing!
The box says to ONLY use the USB cable provided - this is rubbish, any USB cable works. Also the unit does not charge from the PC - it uses a normal button type battery - battery life is likely to be around 6 months of normal use if the Style II is anything to go by.
Overall build quality is good, though it looks to be the same plastic as the Style II - I had an issue there in that the face scratches quite badly over time (a long time). I've mitigated that this time by modifying a mobile phone screen protector to fit the stepper.
Overall, highly recommended IF you will use the PC software. If you won't, you're better off getting the Style II - it has the exact same stepper features and is a very good step counter. This unit ONLY adds computer connectivity, nothing more.