I am sold to Boostor, after using Tubolito (early adopter, expensive AF) - and all versions of RideNow.
Both for my road (28 and 30mm tires) and for my gravel (my gravel is in fact a sort of all road ... 42mm tires).
Why?
- they are slightly thicker: keep pressure better and resist better to punctures (in fact, a single puncture since spring, and that was due to my mistake - snakebite because I didn't check the pressure, and went through a tarmac hole, while the pressure was too low).
- they have metal valve with removable core.
- the weight penalty is 4 or 5 grams over the latest standard version of RideNow - almost insignificant.
- very good reinforcement at the valve - tube junction.
Cons:
- their tube for gravel covers 32-43mm. For recent wider tires, might not be enough?
- they are quite pricey for Aliexpress standards: pretty much like the latest generation of RideNow.
- if only, in this money, they would come with some patches, as RideNow does....
As a general impression: TPU tubes seem to be great for higher pressures, not so great for lower pressures. Quite vulnerable to puncturing when they're not inflated towards the upper limit (at least compared to butyle, where the increased elasticity of the material might help).
I've stopped riding CX for two years, otherwise I'd have been very curious to test them in CX races (Tubolito proved unreliable - a significant number of punctures)... but CX is standard tubeless territory anyway.
BUT.... I'll test these Boostor in winter, for track cycling... let's see how they handle really high pressures on 23mm tires

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