Anybody tried Tubolito inner tubes?

[Globalti]

I'm a bit of a latex addict (ooer) for my best bike but these look as if they have the advantages without the fragility. But the price....!

 

[Heigue'r]

I think there was quite a few problems with air leaking at the valves early days,not sure if that has been sorted,there was a thread about them over on ww