I am now down to two choices...

Choice #1 : Buy a Garmin 510 Performance Package for $399.99

Choice #2 : Buy a RFLKT+ ($129.99), Wahoo Speed/cadence sensor ANT+& BT4.0 (59.99) and MIO Link HR wrist monitor ($83.79)..total ~$280. from Amazon.

The only reservation that I still have about the second choice is the sense that it is not real time data and I am not sure what that means....is there a latency in the data? is it milliseconds or seconds?

It seems that second choice is more flexible and allows for future growth...as long as they don't pop out a BT 5.0 in the near future. LOL I have downloaded 4 cycle apps to the IPhone and am playing with them now. But still worried about what kind of delay I can expect....I did have a Garmin in 2008 or 2009 and the data seemed to be kept pretty current and I couldn't really see much latency in the display.

Can anyone speak to the RFLKT+ delay? Would really like to hear what it is really like.