I'd buy them just because they've got 'sliding nipples'.

Seriously though, this design is novel, but it would be heavier and obviously requires more parts than a 'regular' rim.

It's a tough sell especially when my tubeless wheels are Stans 350g ZTR rims, sealed by 10g of 3M tape and accomplishes the same job.

In 2001 I did a prototype MTB disc wheel that weighed under 600g with a similar rim design to what Gipiemme now uses - double cavity, with paired spokes and the rim CNC machined down to a single cavity design where there wasn't any spokes.

That's another solution someone seriously has to take a look at.

*edit*

Actually, Looks like Gipiemme already has, although they're heavy as.