I guess that one place where I am real likely to use one first is as a spare tube for my tubeless equipped MTB. As it is I don't carry a spare since a suitable butyl tube is so big and I am pretty unlikely enough to need it that I don't take a big heavy butyl tube. A TPU tube is enough smaller and lighter that I might be willing to pack one in the little seat wedge for normal around home trail riding. Then again the tubeless system has been super reliable so unless going pretty far off the beaten path...