The DC Rainmaker review is extremely detailed, just bear in mind that it is fairly old and the unit under review was still in the `Beta` stage. Things I`ve read about the V650; (There are more but to me, these are some of the more important deciding factors when considering a cycling computer) Cons: Battery life only 10hours (rec every sec) - Poor in this day and age considering how long Polar had this unit under development.Route upload done via Polar Flow (their web service), Therefore no mobile/tablet support.Post workout stats available on unit but cant upload wirelessly via a mobile or wifi network. Still too new for a comprehensive review. Time will tell. If you are willing to wait, why not. Maybe if unit records every 5sec`s, battery life would be improved?!Product information/Specs available on their website are very limited. Pro`s: Front `emergency` lightZone (Heart Rate) based training, by a simple touch on each zoneBluetooth Sensors (HR, Cadence and Speed), therefore if you forget your V650 at home, one could use his/her cellphone (preferably in their back pocket) purely to log ride/race, etc.Cheaper than 510Battery life plays a huge part, especially when forking out this amount of money for a training device....based on the fact that this will be used for many years.