I've had them in my front wheel for a few weeks, carbon rim brake setup, last week did 4 x 4km descents without any issue or concern. We have one very steep descent nearby that leaves wheels very hot, may try that in the future if I feel brave.
I haven't had any issues of any kind, I have the 65mm and 85mm valve versions of the Ridenow. I know have 5 tubes, which gives me 3 spares. I love how small they are in my saddle bag - so much so I've moved from a saddle back to a pocket pouch with tube, pump and multitool.
I normally ride latex and the TPU feels very similar in regards ride quality, just lighter and no need to keep pumping tires.