I did a DIY Peloton with a much cheaper Sunny spin bike and have to say it's pretty flawless. Heart rate via the apple watch and cadence via the Wahoo sensor are both displayed on screen during the workout in the Peloton app.I'm interested in this as well. I have an old Garmin 310XT with speed and cadence sensors, but it's old ANT+ instead of Bluetooth tech so it doesn't connect to my Apple Watch during workouts.
I've been looking at Bluetooth Wahoo-style speed / cadence sensors, but they're all really confusing, I think some you have to buy two to get both speed AND cadence, another one it's "flip the battery over" for speed OR cadence, etc. I'd like to know which one would work with Apple Watch, particularly for Fitness+.
I've just been doing "indoor cycling" on Apple Watch which gives me heart rate and time, and then letting Garmin track the speed/cadence during my workout so I can look down and see how fast I'm going, especially in the big boy gears.
My hope is that Apple can offer the same experience and not get cute. I remember the days when copy/paste wasn't a thing on the iPhone, let's not go back to those days.