Two years ago I've tried rolling on TPU (tubolito, aerothan) instead of butyl, and the result was disappointing. I almost never get flats on butyl, and got three (slow leaks) with the TPUs over 2 000kms...

That was then, things may have improved. Reading reviews there are many negative feedbacks, but they seem to be older. On the plus side, TPU tubes take less than half of the space of butyl, so it's tempting to believe that their construction has improved.

Any experience?