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Not well. Was flat the next day. I think it's probably more to my taping qualities, though it did seem to hold well at the time. To be honest, it was only the sealant that was making it anywhere near airtight. Without that, there was too much seepage around the rim. I think my taping was a bit shite in places, which might have resulted in a bad fit on parts of the rim. I need to have a post-mortem, but I was quite gutted next day to find it flat. Hopefully I don't have to resort to a tube.
For the benefit of any other curious early adopters, this is a Kojak on a Brompton Velocity A23, holding 100 psi. Am yet to test ride it, but if the next update comes from hospital you can come to your own conclusions.
Edit: Was flat next day (see comment further down).