Would like some guidance from riders that are currently using a Flight Deck and a HRM - pros and cons. Currently have the Flight Deck and am considering a Polar 720i. Any “gotchas” on using the two (2) together? Does the speed sensor for the HRM mount on the rear wheel? Any advantage to waiting for the introduction of the 725 in November? I am not interested in the Nokia 5140 application.

I think the two together is just duplicating a lot of information.
My Flight Deck and S210 provide me with everything I need.

I was on the same fence, but then I saw that the 720i is down to $260 at performance, and there is a 20% off coupon floating around here.
So, for about $200 you can collect all the data your heart desires ... in a watch! Then you can download it to your computer and analyse it.
So I decided to forego buying the flightdeck and only use the 720i. I really like the fact that I will have all this data in one place.
It is coming in tomorrow......

I have the wireless flight deck and the 720i, and use them both together. If I had it to do over again, I would just go with the 720i and forget the flight deck. The advantage to the polar is you get HR info plus it is downloadable. I can't see any real advantage to the flight deck.

That's pretty much my feeling. I like the Flight Deck but the 720i provides so much more. Any problems with setup?

I have both on my bike. On club rides I have the FlightDeck set to display mileage for use with the cue sheets, and the Polar is set for either speed/cadence or altitude/vertical. The FlightDeck is also set to record time while moving and the Polar is set for total time. I'm a little anal when it comes to information.

Being anal about information - sounds familiar. Good idea about running time vs total time. I try to keep time at rest stops to minimum. Legs just take too long to recover from extended stop.

One of the other attractions of the Polar (other than HRM functions) is altitude/vertical. I'm working hard at improving climbing but I want to make sure that I don't overtrain - been there, done that too many times in the past.

I don't think the altitude function works that well on the Polar. It has little relevance here in flat Florida, but my Polar usually says that I'm 100 ft below sea level.

You really should calibrate the altitude before every ride. It still won't be 100% accurate but for most people, it will be close enough.