Bike Closet is blowing out some Pirelli Smartubes. I picked a few up but no real world experience yet. I'm using them mainly as spares but may go to PU/TPU full time as I have too may wheels that get intermittent use and topping up sealant all the time is annoying. For gravel/MTB I will stick to tubeless.
https://bikecloset.com/product/1601198/