Cons: Console buttons not responsive, not Polar heart rate compatible.
(1) The treadmill is NOT compatible to the market-leading Polar heart rate monitor. You have to buy a chest strap from NordicTrack, AND you have to open the console to install a receiver circuit board. Not easy to do.
(2) The console is NOT responsive at all. It is VERY hard to press buttons, and I believe it is dangerous when you're running hard and you have to press the stop button for some reason ... and then is wouldn't work right away.
I returned the machine after 30 minutes of fiddling around with the heart rate monitor installation and 30 minutes of use.